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The Mineral inesite

Elongated Inesite Crystal Cluster

Inesite is an uncommon but appealing mineral that forms in attractive pink colors. Its crystals often have a very characteristic, chisel-shaped termination on one of the crystal angles. Inesite is likely named for the Greek term ines, which means fibers, alluding to the sometimes fibrous nature of this mineral.

Chemical Formula

Ca2Mn7Si10O28(OH)2 · 5H2O

Color

Light to deep pink, pinkish-red, reddish-brown, maroon, orange

Crystal System

Triclinic

Properties

Streak
Pale pink
Hardness
6
Transparency
Translucent
Specific Gravity
3.0
Luster
Vitreous
Cleavage
1,1;2,1
Fracture
Uneven
Tenacity
Brittle

Crystal Habits

As agglomerates of tabular and bladed crystals. Crystals may appear rhombohedral or scalenohedral due to steep, chisel-shaped terminations. Often fibrous, radiating, and acicular. Occasionally globular, botryoidal, and radial.

Additional Information

Composition
Hydrous calcium manganese silicate, sometimes with some iron
In Group
Silicates; Inosilicates
Striking Features
Color and mode of occurrence
Environment
In hydrothermal replacement deposits of manganese-rich metamorphic rocks and serpentines.
Rock Type
Metamorphic

Uses

Inesite specimens of quality are highly desired by mineral collectors.

Noteworthy Localities

Deep pink Inesite is found in the Fengjiashan Mine, Daye, Hubei Province, China. Well-crystallized and sprays were found at Broken Hill, Yancowinna Co., New South Wales, Australia; and small lavender-pink crystals at the Monte Nero Mine, Rocchetta di Vara, Liguria, Italy.

The Kalahari Manganese Field of South Africa, at both the Wessels Mine in Hotazel and the N'Chwaning Mines in Kuruman, have produced exceptional examples of Inesite, in the form of deep pinkish-red agglomerates of small spiky crystals. In the U.S., the premier locality for Inesite is the Hale Creek Mine, Trinity County, California.

Common Mineral Associations

Apophyllite, Calcite, Quartz, Serpentine, Rhodonite, Axinite, Xonotlite,

Distingushing Similar Minerals

Rhodonite and Rhodochrosite - Form in different crystals.
Erythrite - Much lower hardness, different environment, usually darker color.


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