mineral
Tumbled amazonite
Amazonite, green microcline feldspar (KAlSi₃O₈)
AI-generated identification · may be incorrectBlue-green to green, mottled and polished, with a pearly to vitreous luster; Mohs hardness 6–6.5, specific gravity about 2.55–2.63, triclinic crystal structure, and two cleavages. The specimen’s color and blocky internal pattern are consistent with amazonite, though lighting and treatment can affect appearance.
Identified More mineral →
Explore Tumbled amazonite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Blue-green to green, mottled and polished, with a pearly to vitreous luster; Mohs hardness 6–6.5, specific gravity about 2.55–2.63, triclinic crystal structure, and two cleavages. The specimen’s color and blocky internal pattern are consistent with amazonite, though lighting and treatment can affect appearance.
Formation & geological history
Forms in potassium-rich granitic pegmatites as a variety of microcline, typically during late-stage crystallization of magma. Most specimens are geologically Precambrian to younger, depending on the pegmatite locality.
Uses & applications
Used as a decorative stone, cabochon, bead, carving material, and inexpensive collector mineral; rarely used as an industrial feldspar because attractive material is limited.
Geological facts
Its blue-green color is associated mainly with trace lead and water-related defects in the crystal lattice. It is commonly confused with dyed quartz, aventurine, or turquoise.
Field identification & locations
Common localities include Colorado and Virginia, USA; Brazil; Madagascar; Russia; and Namibia. Identify it by blue-green color, feldspar cleavage, moderate hardness, and blocky white-green pattern; avoid ultrasonic cleaning and harsh impacts.
