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  3. Chloritoid

Collectible minerals - full range in stock "Chloritoid"

Chloritoid is a mineral named for its resemblance to minerals of the chlorite group. It can be distinguished from similar minerals by higher hardness, brittleness and optical parameters. It was first discovered in the Urals.

You can see chloritoid stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Chloritoid

General
Category Nesosilicates
Formula
(repeating unit)		 (Fe,Mg,Mn)2Al4Si2O10(OH)4
IMA symbol Cld
Strunz classification 9.AF.85
Dana classification 52.03.03.01
Crystal system 1A polytype: triclinic
2M polytype: monoclinic
Crystal class 1A polytype: pinacoidal (1)
2M polytype: prismatic (2/m)
Unit cell 1A polytype: a = 9.46 Å,
b = 5.50 Å, c = 9.15 Å;
α = 97.05°, β = 101.56°,
γ = 90.10°
2M polytype: a = 9.50 Å,
b = 5.50 Å, c = 18.22 Å;
β = 101.9°; Z = 4
Identification
Color Dark gray, greenish gray, greenish black
Crystal habit Tabular pseudohexagonal crystals; rosettes, commonly coarsely foliated with foliae typically curved or bent; also massive
Twinning Common on {001}, polysynthetic may be lamellar
Cleavage Perfect on {001}, distinct on {110}; parting on {010}
Tenacity Brittle
Mohs scale hardness 6.5
Luster pearly on cleavage surfaces
Streak White, grayish, or very slightly greenish
Diaphaneity Translucent
Specific gravity 3.46 – 3.80
Optical properties Biaxial (+) or (–)
Refractive index nα = 1.713 - 1.730 nβ = 1.719 - 1.734 nγ = 1.723 - 1.740
Birefringence δ = 0.010
Pleochroism X = olive-green to yellow; Y = grayish blue to blue; Z = colorless to pale greenish yellow
2V angle Measured: 36° to 89°
Dispersion r > v; strong
Chloritoid
Code: 2735
Chloritoid
Irtyash deposit, Kaslinsky district, Chelyabinsk region, South Ural, RF
105*103*78mm

0.00 $ $91.67

Chloritoid
Code: 2736
Chloritoid
Irtyash deposit, Kaslinsky district, Chelyabinsk region, South Ural, RF
65*39*57mm

0.00 $ $20.33

Chloritoid
Code: 2737
Chloritoid
Irtyash deposit, Kaslinsky district, Chelyabinsk region, South Ural, RF
37*33*21mm

0.00 $ $14.67

Chloritoid
Code: 1076
Chloritoid
Irtyash deposit, Kaslinsky district, Chelyabinsk region, South Ural, RF
55*26*35mm

0.00 $ $15.00

Chloritoid
Code: 1077
Chloritoid
Irtyash deposit, Kaslinsky district, Chelyabinsk region, South Ural, RF
42*20*24mm

0.00 $ $13.33

Chloritoid
Code: 1078
Chloritoid
Irtyash deposit, Kaslinsky district, Chelyabinsk region, South Ural, RF
38*38*31mm

0.00 $ $13.33

Chloritoid, Corundum
Code: 1073
Chloritoid, Corundum
Irtyash deposit, Kaslinsky district, Chelyabinsk region, South Ural, RF
97*60*34mm

0.00 $ $40.00

Chloritoid, Corundum
Code: 1075
Chloritoid, Corundum
Irtyash deposit, Kaslinsky district, Chelyabinsk region, South Ural, RF
51*30*20mm

0.00 $ $18.33

Chloritoid, Corundum archived
Code: 1072
Chloritoid, Corundum
Irtyash deposit, Kaslinsky district, Chelyabinsk region, South Ural, RF
99*67*52mm

0.00 $ $31.67

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