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Triplite

Phosphate mineral

Field	Value
name	Triplite
category	Phosphate minerals
image	Triplite-t5105a.jpg
caption	Triplite from Alchuri, Shigar Valley, Baltistan, Pakistan (1.2 × 1 × 0.9 cm)
formula	(Mn,Fe)2(PO4)(F,OH)
IMAsymbol	Trl
strunz	8.BB.10
system	Monoclinic
class	Prismatic (2/m)
(same H-M symbol)
symmetry	I2/a (no. 15)
unit cell	a = 11.97 Å, b = 6.52 Å
c = 10.09 Å; β = 105.62°; Z = 8
color	Chestnut to reddish brown, flesh-red, salmon-pink
habit	Prismatic, massive to nodular
cleavage	Good on {001}, fair on {010}, poor on {100}
fracture	Uneven to subconchoidal
mohs	5 to 5.5
luster	Vitreous to resinous
refractive	nα=1.643–1.684, nβ=1.647–1.693, nγ=1.668–1.703
opticalprop	Biaxial (+)
2V	25 – 76°
dispersion	r v, moderate to strong
pleochroism	Distinct; yellow-brown to reddish brown
streak	White to brown
gravity	3.5 – 3.9
diaphaneity	Translucent to opaque
alteration	Alters to brownish black
references

(same H-M symbol) c = 10.09 Å; β = 105.62°; Z = 8

Triplite is a rare phosphate mineral with formula: . It occurs in phosphate-rich granitic pegmatites typically as irregular brown opaque masses. Triplite was first described in 1813 for an occurrence in Chanteloube, Limousin, France. The name is from the Greek triplos for triple, in reference to the three cleavage directions. In color and appearance, it is very similar to rhodocrosite, another manganese bearing mineral. Chemically, it is also quite similar to triploidite the difference being that triplite is fluorine dominant while triploidite is hydroxide dominant.

Occurrence

Triplite is a rare fluoro-hydroxide phosphate mineral that forms in phosphate rich granite pegmatites and high temperature hydrothermal veins. It has been found in the United States in California, Nevada, Arizona, Colorado, South Dakota, Virginia, Connecticut, and Maine. Other occurrences include the Shigar Valley, Pakistan; China; Bavaria, Germany; Kimito, Finland and Karibib, Namibia.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://rruff.geo.arizona.edu/doclib/hom/triplite.pdf Handbook of Mineralogy]
[http://www.mindat.org/min-4021.html Mindat.org]
[http://webmineral.com/data/Triplite.shtml Webmineral data]
(April 2014). "ON THE CRYSTAL-CHEMISTRY OF A NEAR-ENDMEMBER TRIPLITE, Mn 2+ 2 (PO 4 )F, FROM THE CODERA VALLEY (SONDRIO PROVINCE, CENTRAL ALPS, ITALY)". The Canadian Mineralogist.
[http://www.minsocam.org/msa/collectors_corner/arc/tripliteco.htm Triplite Crystals from Colorado], C. W. Wolf and E. Wm. Heinrich, American Mineralogist, Volume 32, pages 518–526, 1947

Info: Wikipedia Source

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manganese(ii)-minerals iron(ii)-minerals phosphate-minerals monoclinic-minerals minerals-in-space-group-15

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