igneous
Quartz-rich rock fragment
Likely milky quartz with feldspar and possible mica; exact rock type is indeterminate from the image
AI-generated identification · may be incorrectWhite to gray, translucent-to-opaque quartz mixed with brown and gray grains; uneven fracture and granular texture. Quartz is Mohs 7 with a vitreous luster and hexagonal crystal structure; the specimen’s overall hardness and cleavage cannot be determined visually.
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Physical properties
White to gray, translucent-to-opaque quartz mixed with brown and gray grains; uneven fracture and granular texture. Quartz is Mohs 7 with a vitreous luster and hexagonal crystal structure; the specimen’s overall hardness and cleavage cannot be determined visually.
Formation & geological history
The image suggests a small fragment of a quartz-bearing rock, possibly granite or a related vein material. Its formation age and setting cannot be established from appearance alone.
Uses & applications
Quartz-bearing rock is used as aggregate and, when sufficiently pure, in glass and electronics; this small fragment is mainly suitable for collecting.
Geological facts
Quartz is silicon dioxide (SiO₂), one of Earth’s most abundant minerals. The visible mix of grains makes identification of the parent rock uncertain.
Field identification & locations
Look for hard, glassy quartz grains and distinguishable feldspar or mica; a hardness test and fresh surface would help narrow the identification. Quartz-rich rocks occur worldwide, especially in continental crust and quartz veins.
