mineral
Tumbled green stone, possibly amazonite
Undetermined from the image; amazonite is green microcline feldspar, KAlSi₃O₈
AI-generated identification · may be incorrectSmall, smooth, opaque blue-green pebble with a polished surface. If amazonite, hardness is 6–6.5 Mohs, luster vitreous to pearly, and crystals are monoclinic with two cleavages; image alone cannot confirm identity or specific gravity.
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Physical properties
Small, smooth, opaque blue-green pebble with a polished surface. If amazonite, hardness is 6–6.5 Mohs, luster vitreous to pearly, and crystals are monoclinic with two cleavages; image alone cannot confirm identity or specific gravity.
Formation & geological history
If amazonite, it forms in potassium-rich granitic pegmatites as the feldspar crystallizes from cooling magma; its geological age depends on the deposit.
Uses & applications
Tumbled stones are used for collecting, decoration, and inexpensive jewelry; amazonite is also used ornamentally.
Geological facts
Color and shape are not diagnostic: several minerals, including serpentine and aventurine, can look similar when tumbled.
Field identification & locations
A close-up showing streak, translucency, cleavage, or hardness testing would help identify it; amazonite occurs in pegmatites in places such as Colorado, Madagascar, and Russia.
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
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