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Entry № 291

Neptunite

Alkali titanosilicate

Black prisms from the god of the sea.

Chakra

Root · Third Eye

Element

Water · Earth

Zodiac

Scorpio · Pisces

Neptunite

I. The Metaphysical Reading

How the stone has been held.

Neptunite is held as a stone of protection and deep discernment. Its glossy black prisms are said to help sift subconscious material — the parts of a decision usually left unexamined — before bringing them into the light.

Chakra
Root · Third Eye
Element
Water · Earth
Zodiac
Scorpio · Pisces
Keynote
Black prisms from the god of the sea.

II. The Scientific Reading

What the lattice actually does.

Neptunite is a rare alkali titanosilicate mineral, best known from the Benitoite Gem Mine in San Benito County, California, where it occurs as glossy black prisms on white natrolite alongside the blue mineral benitoite. It forms in hydrothermally altered blueschist.

Formula
KNa₂Li(Fe²⁺,Mn²⁺)₂Ti₂Si₈O₂₄
System
Monoclinic
Hardness
5 – 6 (Mohs)
Provenance
USA (California — Benitoite Gem Mine), Greenland

References & Sources

Independent mineralogical references used to verify the scientific details above.

Mineral Profile

Fact Sheet

Chemical Formula
KNa₂Li(Fe²⁺,Mn²⁺)₂Ti₂Si₈O₂₄
Crystal System
Monoclinic
Mohs Hardness
5 – 6 (Mohs)
Density
3.19 – 3.23 g/cm³
Refractive Index
1.690 – 1.740
Provenance
USA (California — Benitoite Gem Mine), Greenland
Color Origin
Deep black to reddish-black, opaque

Related Crystals

Stones that share this lattice

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