igneous

Granite (weathered)

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Hardness: 6-7 (Mohs scale); Color: Pinkish-white with green micas/chlorite; Luster: Dull to pearly (due to weathering); Structure: Phaneritic (visible crystals); Specific Gravity: 2.63 - 2.75.

Hardness: 6-7 (Mohs scale)
Color: Pinkish-white with green micas/chlorite
Luster: Dull to pearly (due to weathering)

Identified March 7, 2026More igneous →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Pinkish-white with green micas/chlorite; Luster: Dull to pearly (due to weathering); Structure: Phaneritic (visible crystals); Specific Gravity: 2.63 - 2.75.

Formation & geological history

Formed from the slow cooling of silica-rich magma deep underground. The rounded shape suggests it has been weathered by water or transport in a fluvial environment. This specimen likely dates from the Proterozoic to Phanerozoic eras.

Uses & applications

Used widely in construction for countertops, floor tiles, and gravel. Rough specimens like this are often kept as educational samples or used as landscaping stone.

Geological facts

Granite makes up a large portion of the Earth's continental crust. Its pink color usually comes from orthoclase feldspar, while the green spots on this specific sample may indicate chlorite alteration or epidote.

Field identification & locations

Identify in the field by its speckled 'salt and pepper' appearance and hardness (it will scratch glass). It is commonly found in mountain ranges or glacial till across North America and Europe.

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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.

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Magnetite

Magnetite (Fe3O4)

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