igneous
Quartz-rich pegmatite, possibly rose quartz
Quartz (SiO₂) in a coarse granitic pegmatite matrix, with iron-oxide staining
AI-generated identification · may be incorrectHardness about 7 Mohs; translucent white to pale pink with reddish-brown inclusions or surface staining; vitreous to sugary luster and irregular fracture. The granular, interlocking texture suggests quartz with minor feldspar or mica rather than a single crystal.
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Physical properties
Hardness about 7 Mohs; translucent white to pale pink with reddish-brown inclusions or surface staining; vitreous to sugary luster and irregular fracture. The granular, interlocking texture suggests quartz with minor feldspar or mica rather than a single crystal.
Formation & geological history
Likely formed from the late-stage, silica-rich fluids of a granitic magma, crystallizing in a pegmatite vein during the Precambrian or younger geologic time. Iron oxidation accounts for the rusty coloration.
Uses & applications
Used mainly as a collector specimen or lapidary material; quartz is widely used in glass, ceramics, abrasives, electronics, and countertops. This rough piece has limited jewelry value unless it cuts or polishes attractively.
Geological facts
The pink color may result from trace iron, irradiation effects, or microscopic mineral inclusions; it is not diagnostic of true rose quartz. A dark cavity could be an iron-stained vug or a weathered pocket containing another mineral.
Field identification & locations
Common in granite and pegmatite regions worldwide, including Brazil, Madagascar, and the United States. Confirm with a glass-scratch test, streak, and close inspection for feldspar or mica; avoid relying on color alone.
