metamorphic
Quartz-rich vein rock, likely milky quartz in schist
Milky quartz (SiO₂) with probable mica schist/greenschist host rock
AI-generated identification · may be incorrectThe central specimen is white to gray, massive milky quartz with a vitreous to dull luster and conchoidal fracture; quartz hardness is 7 and lacks cleavage. Surrounding green-gray rocks appear foliated, likely mica- or chlorite-bearing schist, with hardness roughly 3–6.
Identified More metamorphic →
Explore Quartz-rich vein rock, likely milky quartz in schist in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
The central specimen is white to gray, massive milky quartz with a vitreous to dull luster and conchoidal fracture; quartz hardness is 7 and lacks cleavage. Surrounding green-gray rocks appear foliated, likely mica- or chlorite-bearing schist, with hardness roughly 3–6.
Formation & geological history
Quartz veins form when silica-rich hydrothermal fluids fill fractures and crystallize, commonly during metamorphism; the host schist formed by recrystallization of older sedimentary or volcanic rocks, potentially millions to billions of years ago.
Uses & applications
Common quartz is used for glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces may be collected, though this weathered outcrop material has limited gem value.
Geological facts
Milky color results from microscopic fluid inclusions, fractures, and impurities. The surrounding foliation and aligned minerals indicate intense pressure and deformation.
Field identification & locations
Identify quartz by its white color, glassy fracture, lack of cleavage, and ability to scratch ordinary glass; acid will not fizz. Quartz veins commonly occur in metamorphic belts and fault zones.
More like this
