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Post by 1dave on Jul 9, 2024 8:50:09 GMT -5
IGNEOUS: Gemstones found in igneous rock include the quartzes (including amethyst, citrine and ametrine), the garnets, moonstone, apatite, diamond, spinel, tanzanite, tourmaline, topaz and zircon. Read more here: www.geologyin.com/2018/03/what-gems-are-found-in-igneous-rock.html![1](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRDcvbo1jHw6qorLAYzpCpRpqiaq3StcxMj5wRr6WcC3hjfVofkyzvlebkbb4QUhnTGElITEIeFdPJ4DeBEjrhHVo8Ae7vs0D05nndHSMTAyWrrQe5DRcVgC2C85KdXbmEfNempbMxP0w/w1600-h1023-rw/The+Rock+and+Gem+Book+%25281%2529.jpg) Occasionally, varieties of volcanic glass, obsidian, are cut and fashioned as gemstones. Obsidian is an amorphous mineraloid with the hardness of approximately 5.5. Varieties of obsidian include: Snowflake obsidian ( with inclusions of the mineral cristobalite) Rainbow obsidian Red mahogany obsidian Silver sheen obsidian Midnight lace obsidian Pumpkin obsidian Read more here: www.geologyin.com/2018/03/what-gems-are-found-in-igneous-rock.htmlMETAMORPHIC Examples of gems commonly found in metamorphic rocks include garnet, ruby, sapphire, jade, kyanite, and staurolite. Read more here: www.geologyin.com/2024/04/gemstones-in-metamorphic-rocks.html![2](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnK1jxG97rxnLLw_jhk6MzdpjX_XB5FXJ8tEmYonOM_RS_yMttthzyMXwrbepGYk0k8N4qZzw6MkeokvKs3Y33FZNV_4HZBW80cJR-U0TOlffS43JWknVAPB5dN4BlSpBqkdXXECaPSjh3olbeijB3cSWl0dSBz0AbZ6hzu-1Tvgn-DESyaop1js1cqcg/w1400-h875-rw/gemstones-in-metamorphic-rocks.webp) SEDIMENTARY There are also sedimentary gems: Agate, Azurite, Beryl, chrysoprase, chrysocolla, Malachite, opal, quartz, turquoise. hamed-geo.com/gemstones-found-in-sedimentary-rocks/ For more information about Gem Stones, See:www.geologyin.com/
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