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 More igneous →
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Physical properties
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.
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.
