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Mineral crystals grow under a variety of conditions. Slow cooling of magma (melted rock) deep within the Earth generally leads to a rock such as granite with visible crystals of feldspar, quartz, mica, amphibole and other minerals. Water in the magma can even facilitate pegmatite formation. Pegmatite is an igneous rock composed of mineral crystals generally with a diameter of several centimeters which, on rare occasions, can be meters.

Mineral crystals grow under a variety of conditions. Slow cooling of magma (melted rock) deep within the Earth generally leads to a rock such as granite with visible crystals of feldspar, quartz, mica, amphibole and other minerals. Water in the magma can even facilitate pegmatite formation. Pegmatite is an igneous rock composed of mineral crystals generally with a diameter of several centimeters which, on rare occasions, can be meters.

Four naturally occuring mineral crystals together. Rhodochrosite, Quartz, Pyrite, Galena from Colorado by John Betts. (From the famous, now gone, Sweet Home Mine) by marci

Four naturally occuring mineral crystals together. Rhodochrosite, Quartz, Pyrite, Galena from Colorado by John Betts. (From the famous, now gone, Sweet Home Mine) by marci

Creedite, Fluorite | #Geology #GeologyPage #Mineral    Geology Page  www.geologypage.com

Creedite, Fluorite | #Geology #GeologyPage #Mineral Geology Page www.geologypage.com

Blue Dot Chrysocolla - a cross-section of a blue Chrysocolla tube in Quartz. From Ray mine, Arizona - Nature Is Beautiful

Blue Dot Chrysocolla - a cross-section of a blue Chrysocolla tube in Quartz. From Ray mine, Arizona - Nature Is Beautiful

Vintage Print Rocks and Minerals Quartz Crystals

Vintage Print Rocks and Minerals, Quartz Crystals

Read Message - roadrunner.com

Read Message - roadrunner.com

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