igneous

Feldspathic Granite (likely Syenite or Granite Pegmatite)

Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)

Hardness: 6-6.5 (Mohs scale); Color: Pinkish-orange (orthoclase), gray/white (quartz/plagioclase), black (biotite/hornblende); Luster: Vitreous to pearly; Crystal structure: Monoclinic/Triclinic; Cleavage: Two directions at 90 degrees in feldspar crystals.

Hardness: 6-6
Luster: Vitreous to pearly

Identified March 26, 2026More igneous →

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Physical properties

Formation & geological history

Formed by the slow cooling of silica-rich magma deep within the Earth's crust (intrusive). The large crystal grains indicate a slow cooling process, potentially dating from the Precambrian to Cenezoic eras depending on local basement geology.

Uses & applications

Used primarily in the construction industry as dimension stone, crushed stone for road base, granite countertops, and architectural facing. High-quality specimens of specific minerals within may be collected.

Geological facts

Feldspar is the most abundant mineral group in the Earth's crust. This specific specimen shows iron oxide staining (limonite/hematite), giving it the rusty-orange surface hue frequently seen in weathered outcrops.

Field identification & locations

Identify in the field by its coarse, interlocking crystalline texture and the presence of salmon-pink potassium feldspar. Commonly found in continental shields and mountain belts. Collectors should look for 'flashing' flat cleavage planes when rotating the rock in the sun.

Other igneous specimens

See all

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