metamorphic
Quartz-rich rock with chlorite/epidote vein
Milky quartz with green chlorite or epidote; exact identification requires testing
AI-generated identification · may be incorrectWhite to translucent quartz with a dull vitreous luster and a contrasting moss-green vein. Quartz hardness is about 7 Mohs, lacks cleavage, and has a hexagonal crystal structure; the green mineral may be chlorite (Mohs 2–2.5) or epidote (Mohs 6–7).
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Physical properties
White to translucent quartz with a dull vitreous luster and a contrasting moss-green vein. Quartz hardness is about 7 Mohs, lacks cleavage, and has a hexagonal crystal structure; the green mineral may be chlorite (Mohs 2–2.5) or epidote (Mohs 6–7).
Formation & geological history
Likely formed when silica-rich hydrothermal fluids deposited quartz and green alteration minerals in a fracture, commonly during metamorphism. Its precise geological age cannot be determined from the photograph.
Uses & applications
Primarily a collecting specimen or decorative stone; quartz-rich material may be tumbled or used ornamentally, but this small piece has no significant industrial value.
Geological facts
The green band is not diagnostic from appearance alone: chlorite is typically soft and flaky, whereas epidote is harder and often pistachio-green.
Field identification & locations
Common in metamorphic and hydrothermal terrains worldwide, including veins cutting schist, gneiss, and volcanic rocks. Test hardness, streak, and cleavage; a magnifier can reveal flaky chlorite or granular epidote.
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