Zircophyllite

General
Category| Inosilicate
Formula
(repeating unit)| (K,Na)
3(Mn,Fe2+)
7(Zr,Ti)
2Si

24(O,OH,F)

Strunz classification| 9.DC.05
Dana classification| 69.1.1.5
Crystal system| Triclinic
Crystal class| Pinacoidal (1)
(same H-M symbol)
Space group| P1
Identification
Color| Black-brown
Crystal habit| Platy, micaceous
Cleavage| Perfect on {001}
Fracture| Brittle
Tenacity| Brittle
Mohs scale hardness| 4 – 4.5
|re|er}}| 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)2+
7(Zr,Ti,Nb)
2Si

24(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 natrolite in alkali pegmatites. It was discovered in 1972 in the Korgeredabinsh massif, Tuva, Russia and is named for its 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. ↑ 2.0 2.1 Webmineral data
3. ↑ Handbook of Mineralogy
4. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.

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Manganese minerals

Borates|

* Sussexite
* Tusionite

Carbonates|

* Ankerite
* Kutnohorite
* Rhodochrosite
* Manganoan Calcite

Oxides|

| Simple|

* Hausmannite
* Manganite
* Manganosite
* Nsutite
* Pyrolusite

|

Mixed|

* Birnessite
* Bixbyite
* Ferrocolumbite
* Ferrotantalite
* Galaxite
* Jacobsite
* Manganotantalite
* Psilomelane
* Romanèchite
* Tantalite
* Todorokite
* Umber

Phosphates|

* Childrenite
* Graftonite
* Lithiophilite
* Natrophilite
* Purpurite
* Triplite
* Triploidite
* Zanazziite

Silicates|

* Babingtonite
* Bixbite
* Braunite
* Brownleeite
* Calderite
* Chloritoid
* Eudialyte
* Glaucochroite
* Jeffersonite
* Knebelite
* Ottrelite
* Piemontite
* Pyroxferroite
* Rhodonite
* Spessartine
* Sugilite
* Tephroite
* Zakharovite
* Zircophyllite

Sulfides|

* Alabandite
* Hauerite
* Rambergite

Other|

* Axinite (borosilicate)
* Geigerite (arsenate)
* Manganese nodule (various)
* Samsonite (Sulfosalt)
* Zincobotryogen (sulfate)
* Wolframite (tungstate)
* Hübnerite (tungstate)

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Titanium minerals

Oxide minerals|

| Simple|

* Anatase
* Brookite
* Geikielite
* Rutile

|

Mixed|

* Aeschynite-(Y)
* Armalcolite
* Betafite
* Euxenite
* Freudenbergite
* Haggertyite
* Ilmenite
* Keilhauite
* Latrappite
* Perovskite
* Polycrase
* Zimbabweite
* Zirconolite
* Zirkelite

Silicate minerals|

* Aenigmatite
* Grossmanite
* Keilhauite
* Lorenzenite
* Melanite
* Nenadkevichite
* Titanite
* Zircophyllite

Other|

* Sabinaite (carbonate mineral)
* Warwickite (borate mineral)

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