mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
Hardness: 6–6.5 (Mohs scale), Color: Peach to beige-brown with adularescence, Luster: Vitreous to pearly, Crystal Structure: Monoclinic, Cleavage: Two directions at 90 degrees
- Hardness
- 6–6
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Physical properties
Hardness: 6–6.5 (Mohs scale), Color: Peach to beige-brown with adularescence, Luster: Vitreous to pearly, Crystal Structure: Monoclinic, Cleavage: Two directions at 90 degrees
Formation & geological history
Formed in igneous and metamorphic rocks through the cooling of silica-rich magma where orthoclase and albite separate into microscopic layers. The interaction of light with these layers causes the glow.
Uses & applications
Primarily used in jewelry for cabochons and beads, as well as a popular specimen for metaphysical and mineral collectors.
Geological facts
The shimmering effect of moonstone is known as adularescence, caused by light scattering between alternating layers of feldspar. It was highly popular during the Art Nouveau period and is the state gem of Florida.
Field identification & locations
Identify by its distinctive internal blue or white sheen (adularescence) when rotated under light. Commonly found in Sri Lanka, India, Myanmar, and Madagascar.
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Arenite (SiO2 based)
sedimentary
Schist
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](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral