Non-crystaline Minerals

Obsidian

Sometimes the magna expelled from a volcano cools so quickly that crystals are not able to form. If the magna is rich in silica it forms a type of glass called obsidian.

Chemically, obsidian is very similar to the igneous rocks, granite and rhyolite. If the magna cools slowly, deep within the Earth, it forms large crystals of granite. If it cools more quickly, near or on the Earth's surface, it forms smaller crystals of rhyolite.

 

Tektites

Tektites are lumps of glass, usually small, which are associated with meteorite impacts. They may be shaped like tears, rods, disks, buttons or dumb-bells. They may be black, brown or green.

Tektites may be either the remains of meteorites or they may be formed when meteorites hit the Earth. The collision causes molten rock to be ejected into the air. The molten rock cools quickly to form small glass beads.

Tektite

 


 

Non-crystaline specimens now available (at eBay):

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1x Libyan Gold Tektite

AU $37.00
End Date: Monday May-13-2019 19:05:26 EST
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Glass impact of Meteorite / China Tektite in 29 gr

AU $44.94
End Date: Tuesday May-7-2019 21:51:40 EST
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Darwin Glass (Darwinite) Tektite from Tasmania 4.99grams - Australian Seller

AU $14.25
End Date: Thursday May-2-2019 15:07:19 EST
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Darwin Glass (Darwinite) Tektite from Tasmania 6.58grams - Australian Seller

AU $16.00
End Date: Thursday May-2-2019 15:00:56 EST
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2" Black Obsidian Round Scrying Mirror

AU $24.95
End Date: Tuesday May-21-2019 13:54:48 EST
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Darwin Glass (Darwinite) Tektite from Tasmania 15.36grams - Australian Seller

AU $33.50
End Date: Monday May-6-2019 10:38:11 EST
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Darwin Glass (Darwinite) Tektite from Tasmania 8.17grams - Australian Seller

AU $19.00
End Date: Monday May-6-2019 10:36:09 EST
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