mineral
Tumbled green aventurine/quartzite chips (probable)
Quartz, SiO₂, commonly with fuchsite or chlorite inclusions
AI-generated identification · may be incorrectSmall opaque to translucent dark-green rough/tumbled fragments with a vitreous to waxy luster; quartz hardness is about Mohs 7, no prominent cleavage, and specific gravity near 2.65. The image is insufficient to distinguish aventurine quartz from green serpentine, nephrite, or dyed material with certainty.
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Physical properties
Small opaque to translucent dark-green rough/tumbled fragments with a vitreous to waxy luster; quartz hardness is about Mohs 7, no prominent cleavage, and specific gravity near 2.65. The image is insufficient to distinguish aventurine quartz from green serpentine, nephrite, or dyed material with certainty.
Formation & geological history
Quartz-rich material forms in metamorphic or hydrothermal environments, commonly from silica-rich veins or quartzite; inclusions of fuchsite or chlorite create green color. Geological ages vary widely by locality.
Uses & applications
Used for inexpensive jewelry, beadwork, carvings, decorative stone, and crystal-collecting specimens; low-grade pieces may be sold as craft chips.
Geological facts
Natural green aventurine usually shows subtle glitter from platy mica inclusions, while uniformly intense color may indicate dyeing. A scratch test, streak test, and close examination of fractures can improve identification.
Field identification & locations
Common sources include India, Brazil, Russia, and Tanzania. Verify quartz by hardness and lack of reaction to dilute acid; value is typically $2-$15 for a small craft pouch, or $10-$40 for attractive polished specimens.
