mineral

Feldspar (likely Amazonite or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

Hardness: 6-6.5 on Mohs scale. Color: Pale blue-green to creamy white with tan weathering. Luster: Vitreous to pearly. Crystal Structure: Triclinic or Monoclinic. Cleavage: Two directions at approximately 90 degrees.

Hardness: 6-6
Color: Pale blue-green to creamy white with tan weathering
Luster: Vitreous to pearly

Identified June 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed in plutonic igneous rocks like granite and pegmatites, as well as metamorphic rocks. This specimen likely originates from a coarse-grained pegmatite vein.

Uses & applications

Used in the manufacture of glass and ceramics, as a filler in paint and rubber, and occasionally as a gemstone (amazonite) or for ornamental carvings.

Geological facts

Feldspar is the most abundant mineral group in Earth's crust, making up about 60% of its surface rocks. The blue-green variety is known as Amazonite.

Field identification & locations

Identify by its rectangular blocky shape due to right-angle cleavage and its pearly luster on fresh surfaces. Found globally in granitic terrains.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral