mineral

Feldspar

Feldspar (Orthoclase/Microcline)

AI-generated identification · may be incorrect

Hardness: 6, Color: Orange to reddish-brown, Luster: Vitreous, Crystal structure: Triclinic/Monoclinic, Cleavage: Two directions at approximately 90 degrees

Identified August 25, 2026More mineral →

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Physical properties

Hardness: 6, Color: Orange to reddish-brown, Luster: Vitreous, Crystal structure: Triclinic/Monoclinic, Cleavage: Two directions at approximately 90 degrees

Formation & geological history

Commonly forms in igneous rocks like granite, also found in metamorphic and sedimentary rocks.

Uses & applications

Used in ceramics, glassmaking, and sometimes as a gemstone (e.g., sunstone or moonstone).

Geological facts

Feldspars are the most abundant group of minerals in the Earth's crust, making up about 60% of terrestrial rocks.

Field identification & locations

Identified by its hardness, cleavage, and typical salmon-pink to orange colors in the field. Found worldwide.

Other mineral specimens

See all

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Metamorphic

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Calcite–fluorite mineral specimen with iron-oxide staining

Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides

mineral

Mineral Sand (Heavy Mineral Sand Concentrate)

Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite

mineral

Septarian Pebble

Septarian nodule / Concretion

sedimentary

Granite

Granite (Phaneritic intrusive igneous rock)

igneous