igneous
Diorite with Quartz contact
Intermediate Phaneritic Igneous Rock (Diorite)
AI-generated identification · may be incorrectHardness: 6-7 Mohs; Color: Salt and pepper (black and white); Luster: Dull to sub-vitreous; Structure: Phaneritic (coarse-grained); Cleavage: Good in feldspars; SG: 2.8-3.0
- Hardness
- 6-7 Mohs
- Color
- Salt and pepper (black and white)
- Luster
- Dull to sub-vitreous
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Salt and pepper (black and white); Luster: Dull to sub-vitreous; Structure: Phaneritic (coarse-grained); Cleavage: Good in feldspars; SG: 2.8-3.0
Formation & geological history
Formed by the slow cooling of magma beneath the Earth's surface in volcanic arcs and subduction zones. This specimen shows a contact zone between mafic minerals and lighter quartz/feldspar vein material.
Uses & applications
Used as crushed stone for road construction, as dimension stone for building facades, counter tops, and as landscape gravel or river pebbles.
Geological facts
Diorite was used in ancient Egypt for statues and inscriptions because of its extreme hardness; the famous Code of Hammurabi was carved into a diorite stele.
Field identification & locations
Identify by the distinct 'Dalmatian' or 'salt and pepper' appearance of interlocking light and dark crystals. Commonly found in riverbeds near mountainous tectonic regions.
