Neptunite

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Physical & Optical Properties

Mohs Hardness 5,0 – 6,0
Specific Gravity 3,19 – 3,23
Refractive Index 1,692 – 1,734
Crystal System Monoclinic
Luster Vitreous
Cleavage Perfect
Fracture Conchoidal
Color various
Birefringence 0,029
Pleochroism Pale yellow - yellow-orange - orange to red-brown

Mohs Hardness

Mohs Hardness: 5,0 – 6,0
1 Soft10 Hard

Crystal System

β a b c Monoclinic a ≠ b ≠ c, α = γ = 90°, β ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

About Neptunite

La neptunita es un silicato de potasio, sodio, litio, hierro y titanio que forma cristales prismáticos brillantes de color negro a rojo oscuro con lustre vítreo a submetálico, a menudo asociados con natrolita blanca y benitoíta azul en la mina de San Benito (California, EE. UU.). Es considerada una gema rara y codiciada por los coleccionistas que aprecian la combinación de tres especies minerales en un solo ejemplar. Su nombre hace referencia a Neptuno, dios romano del mar, aludiendo a su color oscuro y profundo.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Neptunite?
La neptunita es un silicato de potasio, sodio, litio, hierro y titanio que forma cristales prismáticos brillantes de color negro a rojo oscuro con lustre vítreo a submetálico, a menudo asociados con natrolita blanca y benitoíta azul en la mina de San Benito (California, EE. UU.). Es considerada una
What is the hardness of Neptunite?
Neptunite has a Mohs hardness of 5.0 to 6.0, making it moderate for use in jewelry.
What color is Neptunite?
Neptunite is primarily Various.
How much does Neptunite cost?
Neptunite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Neptunite?
Neptunite belongs to the Monoclinic crystal system.

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