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  3. Cordierite

Cordierite mineral - You can buy these samples

Cordierite is a mineral with a pronounced property of dichroism, which was discovered during its study. Dichroism is the property of absorbing light differently depending on its polarization. It is typical for contact-metamorphic rocks in conditions of high content of aluminum and magnesium. Cordierite easily changes, turning into muscovite and chlorite. Quality cordierite is used by jewelers as a precious stone.

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

Physical properties of Cordierite

General
Category Cyclosilicate
Formula
(repeating unit)		 (Mg,Fe)2Al4Si5O18
IMA symbol Crd
Strunz classification 9.CJ.10
Dana classification 61.02.01.01
Cordierite group
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group Cccm
Unit cell a = 17.079 Å,
b = 9.730 Å,
c = 9.356 Å; Z = 4
Identification
Color Blue, smoky blue, bluish violet; greenish, yellowish brown, gray; colorless to very pale blue in thin section in transmitted light
Crystal habit Pseudo-hexagonal prismatic twins, as imbedded grains, and massive
Twinning Common on {110}, {130}, simple, lamellar, cyclical
Cleavage Fair on {100}, poor on {001} and {010}
Fracture Subconchoidal
Tenacity Brittle
Mohs scale hardness 7 - 7.5
Luster Greasy or vitreous
Streak White
Diaphaneity Transparent to translucent
Specific gravity 2.57 - 2.66
Optical properties Usually optically (-), sometimes (+); 2V = 0-90°
Refractive index nα = 1.527 - 1.560 nβ = 1.532 - 1.574 nγ = 1.538 - 1.578 Indices increase with Fe content.
Pleochroism X = pale yellow, green; Y = violet, blue-violet; Z = pale blue
Fusibility on thin edges
Diagnostic features Resembles quartz, can be distinguished by pleochroism. Can be distinguished from corundum by its lower hardness
Cordierite
Code: 1214
Cordierite
Petrovo, Kirovohrad region, Ukraine
73*63*36mm

0.00 $ $49.83

Cordierite archived
Code: 2466
Cordierite
Murguba, Umba, Kola Peninsula, RF
33*23*17mm

0.00 $ $26.33

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