Yellow Calcite
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 Crystal Gemstone Healing Orgone Pyramid Reiki Feng Shui  US $7.04
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 Crystal Gemstone Heart Pendant Jasper Quartz Agate Obsidian US $3.90
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 White and Yellow Calcite Tealight Candle holder New 2 lb 136 oz Crystal Healing US $13.95
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 Metaphysical Golden Honey Yellow Calcite Specimen 149 g US $31.20
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 A 09LB 83mm RARE NATURAL RAINBOW YELLOW CALCITE QUARTZ CRYSTAL PYRAMIDS TIBET US $8.99
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 10LB 85mm GOOD NATURAL RAINBOW YELLOW CALCITE QUARTZ CRYSTAL PYRAMIDS TIBET GEM US $11.11
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 Yellow Calcite Tumble Stone Crystal Peace Healing US $3.92
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 A04LB 98mm GOOD NATURAL yellow CALCITE RAINBOW QUARTZ CRYSTAL POINT WAND US $17.99
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 A 05LB 134mm GOOD NATURAL yellow CALCITE RAINBOW QUARTZ CRYSTAL POINT WAND US $18.99
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 A 06LB 121mm GOOD NATURAL yellow CALCITE RAINBOW QUARTZ CRYSTAL POINT WAND US $12.99
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 11lb 143mm rare NATURAL YELLOW CALCITE RAINBOW QUARTZ CRYSTAL POITS WANDS heal US $22.99
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 7NATUNAL YELLOW CALCITE QUARTZ CRYSTAL BALL STAND US $32.01
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 A 06LB 44 GOOD NATURAL PRETTY YELLOW RAINBOW CALCITE QUARTZ CRYSTAL POINTS US $19.99
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 NATURAL YELLOW CALCITE CRYSTAL SPHERE BALL US $8.00
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 14lb 29 GOOD NATURAL YELLOW CALCITE QUARTZ CRYSTAL SPHERE BALL HEALING GEM US $6.99
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 190g AA Rare YELLOW Optical Calcite Crystal Iceland Spar transparent US $2.99
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 NATURAL YELLOW CALCITE CRYSTAL SPHERE BALL HEALING US $12.77
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 4166lb HUGE NATURAL YELLOW calcite Crystal SPHERE BALL US $157.77
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 3902lb HUGE NATURAL YELLOW calcite Crystal SPHERE BALL US $147.77
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 7 NATURAL YELLOW CALCITE CRYSTAL SPHERE BALL STAND US $14.77
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 20 NATURAL YELLOW CALCITE CRYSTAL SPHERE BALL STAND US $57.77
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 8 NATURAL YELLOW CALCITE CRYSTAL SPHERE BALL STAND US $31.77
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 9 NATURAL YELLOW CALCITE CRYSTAL SPHERE BALL STAND US $29.77
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 12 NATURAL YELLOW CALCITE CRYSTAL SPHERE BALL STAND US $32.77
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 2727LB HUGE NATURAL YELLOW calcite Crystal SPHERE BALL US $104.77
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 AA NATURAL YELLOW CLEAR CALCITE CRYSTAL POINT HEALING 310g US $7.77
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 AA NATURAL YELLOW CLEAR CALCITE CRYSTAL POINT HEALING 300g US $7.77
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 Natural Yellow Calcite rolled gold wire wrapped pendant US $29.26
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 4453LB NO1 HUGE NATURAL YELLOW calcite Crystal SPHERE BALL US $167.77
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 Calcite Necklace 07 Yellow Oval Crystal Healing Beaded Stone Natural17 US $20.00
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 Wholesale golden yellow calcite ball sphere 10pcs CB08 US $9.99
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 Beautiful Natural Yellow Calcite Sphere Ball 35MM US $19.99
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 Calcite Pendant 01 Dolphin Yellow Clay Crystal Healing Figurine Animal 4 US $65.00
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 XL SUNSHINE YELLOW CALCITE GEMSTONE CRYSTAL SPHERE 1300 MM 13CM 51 31KG US $159.47
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 AAA 420g RAINBOW NATURAL YELLOW translucence calcite Crystal SPHERE BALL US $10.77
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 Calcite Bracelet 09 Bangle Yellow Orb Silver Copper Wire Crystal Gem 76 US $45.00
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 33lb NATURAL YELLOW CALCITE CRYSTAL SPHERE stand US $13.27
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 YELLOW CALCITE HAND POLISHED PALMSTONE SOLAR 11 oz CREATIVE SOUL EXPRESSION US $13.00
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 Super Clear Yellow Calcite Crystal Point Wand With Great Rainbows US $21.99
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 White and Yellow Calcite Tealight Candle holder New 3lb 23oz Crystal Healing US $13.95
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 ORANGE YELLOW CALCITE CRYSTAL CUTS pagan wicca chakra gemstone US $4.89
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 266lb HUGE NATURAL YELLOW calcite Crystal SPHERE BALL US $9.77
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 Yellow Calcite Sphere Craft US $50.00
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 Calcite Necklace 10 Jasper Rainbow Obsidian Black Yellow Green Crystal 21 US $45.00
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 85mm 335 Yellow Calcite Sphere 14x2 US $45.99
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 22 Pretty Yellow Rainbow Natural Calcite Spheres Balls healing US $39.99
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 80mm 315 Yellow Calcite Sphere 14x4 US $45.99
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 83mm 33 Yellow Calcite Sphere 14x3 US $45.99
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 81mm 32 Yellow Calcite Sphere 14x5 US $45.99
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 83mm 329 Yellow Calcite Sphere 14x1 US $45.99
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 Calcite Necklace 02 Howlite Quartz White Yellow Crystal Healing Stone 20 US $55.00
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 Agate Necklace 09 Dolphin Calcite Yellow Crystal Healing Gemstone 22 US $45.00
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 Agate Necklace 06 Calcite Amethyst Amber Facet Cut Purple Yellow 16 US $80.00
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 CALCITE CLUSTER 24 Crystal Geode Yellow White 05 US $14.25
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 Yellow Calcite Heart Pendant Crystal Pendulum Scrying Dowsing Divination p409 US $8.25
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 Transparent Yellow Calcite Stone Healing Sphere Specimen 35mm US $7.99
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 Calcite Tumble 03 Wholesale Lot of 12 Golden Yellow Crystals Solar Plexus Chakra US $19.00
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 7 Yellow Rainbow calcite spheres healing stand qxp65 US $18.99
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 86mm 337 Gold Honey Yellow Calcite Sphere 15bx2 US $49.99
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 YELLOW CALCITE Gemstone Guardian Angel Packaged with Information US $14.66
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 84mm 331 Gold Honey Yellow Calcite Sphere 15bx1 US $48.99
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 98mm 3 7 8 Gold Honey Yellow Calcite Sphere 16X2 US $54.99
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 Calcite Pendant 05 Honey Yellow Gold Wire Dangle Clasp Stone Gem 33 US $45.00
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 Large Tumbled YELLOW CALCITE Power Clarity Energy STONE US $5.75
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 96mm 341 Gold Honey Yellow Calcite Sphere 16X1 US $52.99
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 TOP 158lb NATURAL YELLOW translucent CLEAR CALCITE CRYSTAL POINT HEALING US $11.99
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 TOP 266lb NATURAL YELLOW translucent CLEAR CALCITE CRYSTAL POINT HEALING US $19.99
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 TOP 427lb NATURAL YELLOW translucent CLEAR CALCITE CRYSTAL POINT HEALING US $31.99
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 TOP 277lb NATURAL YELLOW translucent CLEAR CALCITE CRYSTAL POINT HEALING US $20.77
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 A 057LB 43 NATURAL YELLOW CALCITE QUARTZ CRYSTAL POINTS GEM TIBET HEALING US $14.99
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 Yellow Calcite Crystal Sphere 12 Circumference w Stand Excellent Specimen US $65.00
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 AA NATURAL YELLOW CALCITE CRYSTAL QUARTZ SPHERE BALL US $5.77
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 Large Yellow calcite healing calming Lemon crystal stone vintage rough US $15.88
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 NATURAL YELLOW translucent CLEAR CALCITE CRYSTAL POINT HEALING US $15.77
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 20 NATURAL YELLOW CALCITE CRYSTAL QUARTZ SPHERE BALL STAND US $34.77
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 YELLOW CALCITE POLISHED BE HAPPY MESSAGE STONE GIFT BOX GIFT ITEM US $17.00
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 Yellow Calcite Sphere Orb w stand 3 76mm 15 lbs US $74.99
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 CHAKRA GEMSTONE BOTTLE PENDANT PAGAN WICCAN NEW US $6.26
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 93mm Huge yellow calcite crystal sphere ball US $49.95
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 89mm Huge yellow calcite crystal sphere ball US $29.95
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 397LB NATURAL YELLOW CALCITE CRYSTAL SPHERE BALL US $15.99
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 667LB NATURAL YELLOW calcite Crystal SPHERE BALL US $27.77
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 35mm Stunning Clear Yellow Calcite Crystal Sphere Ball With Great Rainbows US $9.99
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 154lb NATURAL YELLOW CALCITE CRYSTAL SPHERE BALL STAND US $9.99
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 5 YELLOW CALCITE STONES♥ Crystal Healing ♥ REIKI ♥ Polished ♥ Gems ♥ Mineral US $2.95
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What is a Geode?
The formation of Geodes takes place over millions of years and involves several different geological processes.
Hollow Rocks
So, let's start at the beginning: how do you get a hollow rock with lots of sparkling crystals inside? Geodes start their lives as a hollow bubble inside a layer of rock. The bubble could be from air inside explosive volcanic rock or it could come from the hollow remains of animal burrows or tree roots.
What About The Crystals?
Geodes that form from air bubbles inside of volcanic rock are pretty easy to picture. Think about the small air bubbles you see in pumice. Now, imagine just one of those bubbles completely surrounded by black or red volcanic rock. As rain pelts down on the hot bubble, the chemicals in the rock are slowly released into the water. Some of the water soaks through the hard, rocky outside of the bubble and is trapped for a moment on the inside. As the mineral-rich water moves on through the bubble, tiny crystals are left behind, clinging to the sides of the bubble. Millions of years pass while this in and out flow of water gradually builds crystals inside the empty space. The crystal formations might become large single crystals or tightly packed micro-crystals, so small that you can't even distinguish one from another.
An Animal's Home
Let's check out the development of our animal burrow bubble... Long after the animal has moved on or the tree has died and its roots have rotted away, the sediments that surrounded the hollow are being covered up by layers and layers of sediment hundreds of feet think. Eventually the weight of these layers has caused the sediments to turn into rock: sedimentary rock. Just like our volcanic bubble, this animal burrow bubble is host to mineral-filled water flowing in and out through the hollow space. And just like the volcanic bubble, a wide variety of crystals are taking shape inside the animal's former home.
Time Marches On
Fast forward to modern times. The water-soaked land where our bubbles began has become a vast desert where wind howls and the sun beats down. The ground, covered by rocks and scrubby brush yields up unusually shaped rocks. Today, you've found a good field of them and have three nearly-round specimens to crack open when you get home.
All Geodes Are Not Created Equal
The first one is quite hollow but for a nice layer of medium-sized blue crystals. These dugway geodes have bands of blue and pink. The colors come from the different minerals that flowed through the bubble so many millions of years ago. Another specimen is nearly solid all the way through. The microcrystals have formed wide bands of different colors and the tiny opening at the center has a thin ring of pointed crystals. Yet another is completely filled with solid rings of browns, reds and pinks. So, you've really found two geodes and one nodule. Nodule is the name for these round forms when they are filled solid.
Quartz, Calcite, Or What?
Most geodes have interiors made of either quartz or calcite. Quartz crystals are silicates. Silicates are the most common mineral in the crust of the earth. Over 90% of the minerals present in earth's crust are silicates. With this said, you can imagine that silicates are a pretty big group with lots of variation in terms of specific chemical composition.
Calcite's main ingredient is calcium carbonate CaCO2: dissolved calcium and carbon with some of the oxygen from the water thrown in.
Small variations Can Make A Big Difference
Now, add in a trace of iron or magnesium or copper and, voila, you have color variation.
Magnesium traces in calcite forms a nice pink dolomite layer, while magnesium in silicate accounts for the purples of amethyst.
Heat Can Change It
Now if your geode was close to a lot of heat, that could change the color, too. An amethyst that gets a lot of heat loses its purple color and becomes a soft yellow or citrine. You can see why there are so many color possibilities.
A Day In The Life
So, that little geode you're holding has had quite a journey getting to your hand. Treasure it for its beauty, but also for its history and the complex composition of minerals that made it. You're holding millions of years of work in your hand...enjoy touching the miracle of our earth's creation.
About the Author
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Geodes
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