metamorphic

Quartz vein in dark host rock

Likely milky quartz in a fine-grained mafic or metamorphic host; exact host identification is uncertain from the image.

AI-generated identification · may be incorrect

The white portion appears to be milky quartz (Mohs 7; vitreous to waxy, white, no cleavage, hexagonal crystals). The dark brown-black host is fine-grained with a rough, reflective fracture; its mineral composition and hardness cannot be determined reliably from the photo.

Identified October 6, 2026More metamorphic →

Explore Quartz vein in dark host rock in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Quartz vein in dark host rock
Scientific name: Likely milky quartz in a fine-grained mafic or metamorphic host; exact host identification is uncertain from the image.
Category: metamorphic
Identified: October 6, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small, common hand specimen; value depends on confirmed identification, size, and presentation.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Quartz commonly precipitates from silica-rich fluids in fractures, often during metamorphism or later hydrothermal activity. The host rock’s age and formation setting cannot be established from appearance alone.

Uses & applications

Common quartz-bearing rocks are collected as specimens; quartz is used in glass, electronics, and abrasives, while suitable host rock may be used as aggregate or building stone.

Geological facts

The contrasting white vein and dark host are typical of mineral-filled fractures, but the image does not show enough diagnostic detail to name the host confidently.

Field identification & locations

Look for the quartz’s glassy appearance, lack of cleavage, and hardness sufficient to scratch glass. Similar veins occur in many metamorphic and igneous terrains worldwide.