mineral
Tumbled pale green aventurine or chalcedony
Quartz-group silica, primarily microcrystalline SiO₂; possible fuchsite-bearing aventurine
AI-generated identification · may be incorrectTypically Mohs hardness 6.5–7, translucent pale green, with a waxy to vitreous luster and no visible cleavage. The rounded shape and smooth surface indicate tumbling; internal inclusions or fractures create the cloudy appearance.
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Physical properties
Typically Mohs hardness 6.5–7, translucent pale green, with a waxy to vitreous luster and no visible cleavage. The rounded shape and smooth surface indicate tumbling; internal inclusions or fractures create the cloudy appearance.
Formation & geological history
Forms when silica-rich fluids fill fractures or cavities, later crystallizing as chalcedony or quartz; green aventurine gains color from mica or other inclusions. Exact geological age cannot be determined from the photograph.
Uses & applications
Used as a decorative tumbled stone, carving material, and inexpensive cabochon or jewelry component; not generally used structurally.
Geological facts
The specimen may also be pale-green fluorite or glass, but its rounded lapidary form is consistent with a processed geological material. A scratch test and refractive or specific-gravity testing would distinguish alternatives.
Field identification & locations
Common sources include Brazil, India, Madagascar, and Africa. Quartz varieties resist scratching by steel; aventurine commonly shows subtle glitter, while chalcedony has a more uniform waxy appearance.
