metamorphic
Greenstone with Magnetite Veins
Metabasalt (Greenstone)
Hardness: 5-6.5 Mohs. Color: Dull olive green with dark black/grey mineral bands. Luster: Dull to waxy. Structure: Massive or foliated. Cleavage: None. Specific Gravity: 2.8-3.0.
- Hardness
- 5-6
- Color
- Dull olive green with dark black/grey mineral bands
- Luster
- Dull to waxy
Identified More metamorphic →
Explore Greenstone with Magnetite Veins in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 5-6.5 Mohs. Color: Dull olive green with dark black/grey mineral bands. Luster: Dull to waxy. Structure: Massive or foliated. Cleavage: None. Specific Gravity: 2.8-3.0.
Formation & geological history
Formed through low-grade metamorphism (greenschist facies) of mafic igneous rocks like basalt. The green color comes from minerals like chlorite, epidote, or actinolite. The dark bands are often magnetite or hematite deposited in fractures.
Uses & applications
Commonly used as crushed stone in construction, river rock landscaping, and occasionally carved into small ornaments or cabochons.
Geological facts
Greenstones were historically used by indigenous peoples to create durable tools and weapons due to their toughness. They are significant components of ancient Archean greenstone belts.
Field identification & locations
Identify in the field by its distinct dull green hue and lack of visible crystal grains. Often found as water-worn pebbles in riverbeds or glacial tills. Collectors look for pieces with high-contrast mineral banding.
More like this
