mineral
Unidentified pale yellow-green mineral/rock fragment
Possibly sulfur-bearing mineral, serpentine, or weathered limestone; exact identification requires testing
AI-generated identification · may be incorrectIrregular, dull to weakly translucent yellow-green piece with earthy texture and no clearly visible crystals. Hardness and specific gravity cannot be determined from the image; test streak, hardness, and reaction to dilute acid.
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Physical properties
Irregular, dull to weakly translucent yellow-green piece with earthy texture and no clearly visible crystals. Hardness and specific gravity cannot be determined from the image; test streak, hardness, and reaction to dilute acid.
Formation & geological history
Could form through hydrothermal alteration, weathering, or sedimentary mineral precipitation; geological age is indeterminate from appearance alone.
Uses & applications
No reliable industrial or jewelry use can be assigned without identification; attractive pieces may have minor collector value.
Geological facts
Color alone is insufficient because several minerals—including sulfur, green calcite, serpentine, and iron-stained materials—can look similar.
Field identification & locations
Check whether it scratches glass (Mohs >5.5), leaves a colored streak, reacts with vinegar or hydrochloric acid, or has a sulfurous odor when gently rubbed; avoid heating unknown specimens. Common possibilities occur in altered volcanic rocks, carbonate deposits, and weathered ultramafic rocks.
