Chloritoid

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Chloritoid
Crystal class
1A polytype: pinacoidal (1)
2M polytype: prismatic (2/m)
Unit cell1A 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
ColorDark gray, greenish gray, greenish black
Crystal habitTabular pseudohexagonal crystals; rosettes, commonly coarsely foliated with foliae typically curved or bent; also massive
2V angle
Measured: 36° to 89°
Dispersionr > v; strong
References[2][3][4]

Chloritoid is a silicate mineral of

specific gravity of 3.52 to 3.57. It typically occurs in phyllites, schists and marbles
.

Both

polytypes exist and both are pseudohexagonal.[2][3]

It was first described in 1837 from localities in the Ural Mountains region of Russia. It was named for its similarity to the chlorite group of minerals.[3][4]

References

  1. S2CID 235729616
    .
  2. ^ a b Handbook of Mineralogy
  3. ^ a b c Mindat
  4. ^ a b Webmineral data


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