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Gemstones 250x250

The Mineral schorlomite

Single Black Schorlomite Crystal

Schorlomite is sometimes regarded as a titanium-rich variety of Andradite, but it is recognized by the IMA as a distinct mineral species. Schorlomite is a rare member of the Garnet group, and some specimens labeled as Schorlomite are really just the Melanite form of Andradite. Schorlomite is named for its resemblance to the black Tourmaline mineral Schorl.

Chemical Formula

Ca3(Fe3+,Ti)2(Si,Ti)3O12

Color

Dark brownish-black to black

Crystal System

Isometric

Properties

Streak
Colorless
Hardness
7 - 7.5
Transparency
Opaque
Specific Gravity
3.8 - 3.9
Luster
Vitreous
Cleavage
None
Fracture
Conchoidal to uneven
Tenacity
Brittle

Crystal Habits

As small dodecahedral and trapezohedral crystals. Crystals are usually microcrystalline. Also grainy and massive.

3D Crystal Atlas

Additional Information

Composition
Calcium iron titanium silicate
In Group
Silicates; Nesosilicates; Garnet Group
Striking Features
Color, crystals, and environment
Environment
In alkaline-rich igneous environments.
Rock Type
Igneous

Other Names

Ferrotitanite

Noteworthy Localities

Schorlomite is not a common mineral. Its type locality, which has produced good individual crystals, is Magnet Cove, Hot Spring Co., Arkansas. Other localities include Jabal Bou-Agrao, Khénifra Province, Morocco; Tanfit, Ouarzazate Province, Morocco; and Hillesheim, in the Eifel Mountains of Germany.

Common Mineral Associations

Calcite, Magnetite, Orthoclase, Nepheline, Apatite

schorlomite Photos



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