igneous

Granite (Pink/Red variety)

Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Hardness: 6-7 Mohs; Color: Pinkish-orange (orthoclase), white (plagioclase), grey (quartz), and black (biotite/amphibole); Luster: Vitreous to pearly; Crystal structure: Phaneritic (coarse-grained, visible crystals); Cleavage: Perfect on feldspar grains, none on quartz.

Hardness: 6-7 Mohs
Luster: Vitreous to pearly

Identified March 24, 2026More igneous →

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Physical properties

Formation & geological history

Formed from the slow crystallization of magma below Earth's surface (plutonic). This cooling occurs over thousands to millions of years, allowing large crystals to grow. Common geological ages range from the Precambrian to the Cenozoic.

Uses & applications

Widely used in construction for countertops, floor tiles, paving stones, and monument sculpting. Due to its durability and resistance to weathering, it is a primary material for outdoor memorials and infrastructure.

Geological facts

Granite makes up a large portion of the Earth's continental crust. The pink hue in this specimen is caused by an abundance of potassium feldspar (orthoclase). Granite is much harder than marble and resistant to acid rain.

Field identification & locations

Identify in the field by its 'salt and pepper' or interlocking crystalline texture and its extreme hardness; it will easily scratch glass. Found globally in mountain ranges and continental shields. Collectors look for unique mineral inclusions like tourmaline or large feldspar phenocrysts.

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

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

mineral

Magnetite

Magnetite (Fe3O4)

mineral