Sanguite Explained

Sanguite
Category:Halides
Formula:KCuCl₃
Imasymbol:Sgu
System:monoclinic
Class:2/m
Symmetry:2/ m - prismatic
Unit Cell:V = 481.38 ų
Color:bright red
Twinning:polysynthetic twinning has been observed.
Cleavage:Perfect
Fracture:staggered, step-like
Tenacity:fragile
Luster:Vitreous
Opticalprop:biaxial
Refractive:n α = 1.653(3) n β = 1.780(6) n γ = 1.900(8)
Birefringence:δ = 0.247
Pleochroism:strong
2V:Measured: 85° (5)Calculated: 82°
Dispersion:very strong
Streak:reddish orange
Density:2.86(1) g/cm³ (measured);2.88 g/cm³ (calculated)

Sanguite is a halide mineral. It is named after the Latin word sanguis, meaning blood, due to its bright red colouration. It was approved as a valid species by the International Mineralogical Association in 2013.

Characteristics

Sanguite is a chloride with the chemical formula KCuCl3. It crystallizes in the monoclinic system and has a Mohs scale hardness of 3.

Formation and deposition

Sanguite was discovered in the Glavnaya Tenoritovaya fumarole on the Tolbachik Volcano in Kamchatka Krai, Russia, the only place on Earth where it is known to form.[1] There it forms in clusters or crusts as fine prismatic crystals up to 1 mm long and 0.2 mm thick.

Notes and References

  1. Web site: June 23, 2023 . Sanguite . July 8, 2023 . Mindat.org. The map of localities is at the bottom of the page, showing it is only known to form on Tolbachik.