mineral
Quartz-rich rock, possibly milky quartz with iron staining
Quartz (SiO₂), likely with limonite/goethite inclusions and minor feldspar or carbonate
AI-generated identification · may be incorrectPale cream to translucent yellow-white, glassy to waxy luster, irregular fracture, and no obvious cleavage; quartz hardness is 7 Mohs and specific gravity about 2.65. The brown patches likely represent iron-oxide staining or inclusions.
Identified More mineral →
Explore Quartz-rich rock, possibly milky quartz with iron staining in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Pale cream to translucent yellow-white, glassy to waxy luster, irregular fracture, and no obvious cleavage; quartz hardness is 7 Mohs and specific gravity about 2.65. The brown patches likely represent iron-oxide staining or inclusions.
Formation & geological history
Most likely formed in a hydrothermal vein or silica-rich pegmatitic environment, where quartz crystallized from hot fluids and later weathered. The specimen’s exact geological age and locality cannot be determined from the photograph.
Uses & applications
Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive pieces are collected as mineral specimens. This example has modest decorative value unless locality or crystal form proves distinctive.
Geological facts
Milky quartz becomes cloudy because microscopic fluid inclusions, fractures, or other minerals scatter light. Yellow-brown coloration commonly develops when iron-bearing minerals oxidize near the surface.
Field identification & locations
Look for scratch resistance against glass, conchoidal fracture, and lack of cleavage; avoid relying on color alone. Common worldwide in quartz veins, pegmatites, and metamorphic rocks.
