← The Atlas

Entry № 047

Black Moonstone

Orthoclase-Albite Feldspar

The moon on a new-moon night.

Chakra

Root · Third Eye

Element

Water · Earth

Zodiac

Cancer · Scorpio

Black Moonstone

I. The Metaphysical Reading

How the stone has been held.

Black moonstone is carried as a companion for the darker moons, the new moon in particular, when a practitioner is setting rather than harvesting. It is worked with for beginnings that have to be made in private, and for cycles of the body and life that need to be observed rather than pushed.

Chakra
Root · Third Eye
Element
Water · Earth
Zodiac
Cancer · Scorpio
Keynote
The moon on a new-moon night.

II. The Scientific Reading

What the lattice actually does.

Black moonstone is a variety of orthoclase-albite feldspar in which fine perthitic intergrowths scatter light into the soft blue sheen called adularescence. Its dark ground comes from finely distributed inclusions of amphibole, biotite and hematite; when polished it retains the silvery flash of paler moonstone against a smoky base. Madagascar is currently the principal commercial source.

Formula
(K,Na)AlSi₃O₈
System
Monoclinic (perthitic intergrowth)
Hardness
6 – 6.5 (Mohs)
Provenance
Madagascar, India, Sri Lanka

References & Sources

Independent mineralogical references used to verify the scientific details above.

Mineral Profile

Fact Sheet

Chemical Formula
(K,Na)AlSi₃O₈
Crystal System
Monoclinic (perthitic intergrowth)
Mohs Hardness
6 – 6.5 (Mohs)
Density
2.56 – 2.62 g/cm³
Refractive Index
1.518 – 1.526
Provenance
Madagascar, India, Sri Lanka
Color Origin
Dark grey to smoky black with blue and silver adularescence

Related Crystals

Stones that share this lattice

Explore the full Atlas →

Next in the Atlas

Black Obsidian

The mirror the earth cooled too fast to lose.