metamorphic
Pale greenish quartz-bearing rock, possibly serpentine or altered feldspar
Tentatively serpentinite-related rock (serpentine-group minerals) or altered granitic material; identification is uncertain from the photograph
AI-generated identification · may be incorrectSmall angular fragment with pale green, cream, and yellow coloration, dull-to-waxy luster, and apparent granular/crystalline texture. Likely hardness about 3–7 depending on composition; no clear cleavage or crystal faces are visible.
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Physical properties
Small angular fragment with pale green, cream, and yellow coloration, dull-to-waxy luster, and apparent granular/crystalline texture. Likely hardness about 3–7 depending on composition; no clear cleavage or crystal faces are visible.
Formation & geological history
Possible hydrothermal or metamorphic alteration of ultramafic rock, or weathering of feldspar-rich igneous rock. The Guerrero region near 16.9°N, 99.8°W contains diverse igneous and metamorphic rocks, so a local altered rock is plausible.
Uses & applications
As an unverified fragment it has little commercial value; attractive polished pieces of serpentine or quartz-bearing rock may be used decoratively or as inexpensive lapidary material.
Geological facts
The reported slight internal sparkle is consistent with tiny quartz, feldspar, mica, or serpentine surfaces. A firm identification requires hardness, streak, acid, and ideally magnification tests.
Field identification & locations
Likely worth under $1 as a common local specimen, or roughly $5–$20 if polished and attractive. Test whether it scratches glass (quartz-rich material), whether a steel nail scratches it, and whether pale powder forms on unglazed ceramic; avoid assuming it is jade without laboratory testing.
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