igneous

Granite (Weathered)

Granitic intrusive rock

Hardness: 6-7 on Mohs scale; Color: typically mottled grey, white, and pinkish-brown (weathered); Luster: Vitreous to dull; Crystal structure: Phaneritic (visible interlocking grains); Specific Gravity: 2.63-2.75

Hardness: 6-7 on Mohs scale
Color: typically mottled grey, white, and pinkish-brown (weathered)
Luster: Vitreous to dull

Identified April 7, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow cooling of silica-rich magma deep underground (intrusive). The weathering suggests this specimen was exposed to elements, likely from the Phanerozoic eon.

Uses & applications

Used extensively in construction for countertops, flooring, monuments, and as crushed stone for road base.

Geological facts

Granite makes up a large portion of the Earth's continental crust. It is extremely durable and has been used since ancient Egypt for building pyramids and obelisks.

Field identification & locations

Identify by its interlocking crystalline texture containing quartz (glassy), feldspar (opaque/colored), and mica (shiny flakes). Found in large batholiths or as erratic boulders in glacial areas.

Other igneous specimens

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Igneous