metamorphic

Quartz Veined Mudstone

Metasedimentary rock with Quartz (SiO2) veins

AI-generated identification · may be incorrect

Hardness: 7 (veins) to 5.5 (host rock). Color: Grey, tan, and white. Luster: Vitreous to dull. Cleavage: Indistinct. The specimen shows secondary mineral precipitation (quartz) within fractures of a sedimentary or low-grade metamorphic host.

Hardness: 7 (veins) to 5
Color: Grey, tan, and white
Luster: Vitreous to dull

Identified July 18, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when hydrothermal fluids rich in silica injected into fractures of a pre-existing mudstone or siltstone under heat and pressure, typically during mountain-building events.

Uses & applications

Landscaping, educational specimens, and rough material for amateur lapidary work. Most valuable for teaching geological structural processes.

Geological facts

The white bands indicate 'crack-seal' events where the rock literally split open and was 'healed' by mineral growth from circulating groundwater multiple times.

Field identification & locations

Identify by the distinct white crystalline bands cutting through a darker, finer-grained matrix. Often found in riverbeds or areas with significant tectonic history.