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Hematite Specimen 2

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Original price $600
Current price $550

A very fascinating specimen of Hematite with perfect shape and build. 

Dimensions (length, width, height): 11.5cm x 4.8cm x 9.8cm

Weight: 308 grams

Origin: Shigar mine, Skardu, Northern area, Pakistan.

Color: Metallic Black


The star shape termination of the specimen is perfect from all angles.

 

It looks like a black flower.

 

 

HEMATITE

Hematite, also spelled as haematite, is a common iron oxide with a formula of Fe2O3 and is widespread in rocks and soils. Hematite forms in the shape of crystals through the rhombohedral lattice system, and it has the same crystal structure as ilmenite and corundum. Hematite is colored black to steel or silver-gray, brown to reddish-brown, or red. It is mined as the main ore of iron. Varieties include kidney ore, martite (pseudomorphs after magnetite), iron rose and specularite (specular hematite). Hematite is harder than pure iron, but much more brittle.

Large deposits of hematite are found in banded iron formations. Gray hematite is typically found in places that can have still, standing water or mineral hot springs, such as those in Yellowstone National Park in North America. The mineral can precipitate out of water and collect in layers at the bottom of a lake, spring, or other standing water. Hematite can also occur without water, usually as the result of volcanic activity. Clay-sized hematite crystals can also occur as a secondary mineral formed by weathering processes in soil, and along with other iron oxides or oxyhydroxides such as goethite, is responsible for the red color of many tropical, ancient, or otherwise highly weathered soils.

Hematite residues are also found in graves from 80,000 years ago. Near Rydno in Poland and Lovas in Hungary red chalk mines have been found that are from 5000 BC, belonging to the Linear Pottery culture at the Upper Rhine. Rich deposits of hematite have been found on the island of Elba that have been mined since the time of the Etruscans.

 

Jewelry

Hematite's popularity in jewelry rose in England during the Victorian era, due to its use in mourning jewelry. Certain types of hematite- or iron-oxide-rich clay, especially Armenian bole, have been used in gilding. Hematite is also used in art such as in the creation of intaglio engraved gems. Hematine is a synthetic material sold as magnetic hematite.

GENERAL

Category

Oxide minerals

Formula

iron(III) oxide, Fe2O3, α-Fe2O3

Strunz classification

4.CB.05

Crystal system

Trigonal

Crystal class

Hexagonal scalenohedral (3m)
H–M symbol: (3 2/m)

Space group

R3c

Unit cell

a = 5.038(2) Å;
c = 13.772(12) Å; Z = 6

IDENTIFICATION

Color

Metallic gray, dull to bright "rust-red" in earthy, compact, fine-grained material, steel-grey to black in crystals and massively crystalline ores

Crystal habit

Tabular to thick crystals; micaceous or platy, commonly in rosettes; radiating fibrous, reniform, botryoidal or stalactitic masses, columnar; earthy, granular, oolitic

Twinning

Penetration and lamellar

Cleavage

None, may show partings on {0001} and {1011}

Fracture

Uneven to sub-conchoidal

Tenacity

Brittle

Mohs scale hardness

5.5–6.5

Luster

Metallic to splendent

Streak

Bright red to dark red

Diaphaneity

Opaque

Specific gravity

5.26

Density

5.3

Optical properties

Uniaxial (−)

Refractive index

nω = 3.150–3.220, nε = 2.870–2.940

Birefringence

δ = 0.280

Pleochroism

O = brownish red; E = yellowish red