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Zircophyllite

Zircophyllite
General
Category Inosilicate
Formula
(repeating unit)
(K,Na)3(Mn,Fe2+)7(Zr,Ti)2Si8O24(O,OH,F)7
Strunz classification 9.DC.05
Dana classification 69.1.1.5
Crystal symmetry Triclinic pinacoidal
H-M symbol: (1)
Space group: P1
Identification
Color Black-brown
Crystal habit Platy, micaceous
Crystal system Triclinic
Cleavage Perfect on {001}
Fracture Brittle
Tenacity Brittle
Mohs scale hardness 4 - 4.5
Luster Adamantine, vitreous
Streak Light brown
Diaphaneity Translucent to opaque
Specific gravity 3.34
Optical properties Biaxial (-)
Refractive index nα = 1.708 nβ = 1.738 nγ = 1.747
Birefringence δ = 0.039
Pleochroism X = Y = dark yellow; Z = brown
2V angle Measured: 62°, calculated: 56°
Common impurities Hf,H2O
References [1][2][3]

Zircophyllite is a complex mineral, formula (K,Na)3(Mn,Fe)7(Zr,Ti,Nb)2Si8O24(OH,F)7. It crystallizes in the triclinic - pinacoidal crystal class as dark brown to black micaceous plates. It has perfect 001 cleavage, a Mohs hardness of 4 to 4.5 and a specific gravity of 3.34. Its indices of refraction are nα=1.708 nβ=1.738 nγ=1.747 and it has a 2V optical angle of 62°.

It occurs with zirconium content and its relationship to astrophyllite. It is also known from the Mont Saint-Hilaire intrusive complex of Québec, Canada.

Zircophyllite is radioactive, but the radioactivity is barely detectable.[2]

References

  1. ^ Mindat.org
  2. ^ a b Webmineral data
  3. ^ Handbook of Mineralogy


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