Igneous

Granite

Granite (High-silica plutonic rock)

Hardness: 6-7 on Mohs scale; Color: Phaneritic texture with visible grains of white/grey feldspar, translucent quartz, and dark biotite or hornblende; Luster: Vitreous to dull; Crystal structure: Granular/Crystalline.

Hardness: 6-7 on Mohs scale
Luster: Vitreous to dull

Identified April 11, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface (intrusive). This specific countertop specimen is a commercial 'White Granite' likely containing garnets (the purple spots).

Uses & applications

Predominantly used in construction, architectural facades, and interior design for countertops and flooring due to its durability and aesthetic appeal.

Geological facts

Granite makes up a large portion of the Earth's continental crust. The purple spots visible in this specific slab are likely almandine garnets, which are common accessory minerals in certain granitic rocks.

Field identification & locations

Identify in the field by its coarse-grained (phaneritic) texture where individual mineral crystals are visible to the naked eye. Commonly found in continental mountain ranges and batholiths.

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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