mineral
Tumbled green stone, possibly amazonite
Possibly amazonite, a green variety of microcline feldspar (KAlSi₃O₈)
AI-generated identification · may be incorrectOpaque, blue-green, smoothly rounded and polished with a subdued vitreous-to-waxy luster. Amazonite has Mohs hardness 6–6.5 and a triclinic crystal structure; the image alone does not confirm the identification.
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Physical properties
Opaque, blue-green, smoothly rounded and polished with a subdued vitreous-to-waxy luster. Amazonite has Mohs hardness 6–6.5 and a triclinic crystal structure; the image alone does not confirm the identification.
Formation & geological history
If amazonite, it formed as potassium feldspar in slowly cooled, silica-rich granitic pegmatites, commonly millions to billions of years old. The rounded shape and surface sheen indicate tumbling or polishing.
Uses & applications
Tumbled stones are used for collecting, crafts, and inexpensive jewelry; amazonite is also used decoratively.
Geological facts
Amazonite’s blue-green color is associated with trace elements and structural effects in the feldspar; despite its name, it is not reliably sourced from the Amazon River region.
Field identification & locations
The photo shows a small, opaque green tumbled specimen, but color alone is insufficient to distinguish amazonite from other stones or dyed material. Confirm with hardness, streak, and feldspar cleavage tests.
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