Triplite

Triplite

Infobox mineral
name = Triplite
category = Phosphate mineral
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formula = (Mn,Fe)2(PO4)(F,OH)
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color = Brown, Salmon, Red
habit = Prismatic, Massive to granular
system = Monoclinic
twinning =
cleavage = Good
fracture = Uneven - Flat surfaces
mohs = 5
luster = Resinous - Greasy
refractive = nα=1.650, nβ=1.660, nγ=1.680
opticalprop =
birefringence =
pleochroism =
streak = Yellowish gray
gravity = 3.44 - 3.9
density =
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Triplite (Mn,Fe2+)2(PO4)(F,OH) is a rare mineral that forms in phosphate-rich granitic, pegmatites typically as irregular brown opaque masses. Triplite was first described in 1813 for an occurrence in Chanteloube, Limousin, France. [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] The name is from the Greek "triplos" for triple, in reference to the three cleavage directions. It has rather low hardness for a gemstone, at 5-5.5 on the Mohs scale. 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 F dominant while triploidite is OH dominant.

Triplite is quite rare and difficult to facet due to its brittleness and cleavage. Only a few cut stones have been reported and all of them are from the Shigar Valley in Pakistan. One specimen from Dudley Blauwet was loaned to the GIA for examination. General absorption to 450nm, weak absorption bands at 470nm and 490nm and a stronger band at 520 – 620nm were observed with a desk model spectroscope. Microscopic inspection revealed finger print type and two phase inclusions. [http://www.multicolour.com/catalogue/?/desc/triplite/ Triplite classification] (2006, June 05). In Multicolour Gemstones Library. ]

Occurrence

Triplite (Mn,Fe2+)2(PO4)(F,OH) is a rare fluoro-hydroxide phosphate mineral that forms in phosphate rich granite pegmatites and high temperature hydrothermal veins. 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. [http://www.multicolour.com/triplite/ Rare gem triplite specimen discovered in Tucson.] (2006, June 05). Multicolour Gem Ltd. Retrieved online 07:45, June 05, 2007 ]

ee also

*List of minerals

References

External links

* [http://www.multicolour.com/triplite/ Notable triplite from Multicolour Gems Ltd.]
* [http://webmineral.com/data/Triplite.shtml Classification from Webmineral]


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Look at other dictionaries:

  • TRIPLITE — Minéral de couleur brun sombre (rose saumon dans les variétés riches en manganèse) devenant noir de poix par altération, la triplite doit son nom à la présence de trois clivages. Elle cristallise dans le système monoclinique en éléments grossiers …   Encyclopédie Universelle

  • Triplite — Trip lite, n. [Cf. F. triplite. See {Triple}.] (Min.) A mineral of a dark brown color, generally with a fibrous, massive structure. It is a fluophosphate of iron and manganese. [1913 Webster] …   The Collaborative International Dictionary of English

  • triplite — /trip luyt/, n. a dark brown, massive mineral, fluorophosphate of iron and manganese. [1840 50; < G Triplit. See TRIPLE, ITE1] * * * ▪ mineral       phosphate mineral, consisting of manganese, iron, magnesium, and calcium phosphate [(Mn, Fe, Mg,… …   Universalium

  • triplite — (entrée créée par le supplément) (tri pli t ) s. f. Terme de minéralogie. Phosphate de manganèse et de fer, qui se rencontre, en masses clivables, dans les granits du Limousin …   Dictionnaire de la Langue Française d'Émile Littré

  • triplite — trip·lite …   English syllables

  • triplite — ˈtriˌplīt noun ( s) Etymology: German triplit, from tripl + it ite; from its threefold cleavage : a dark brown monoclinic basic phosphate of manganese, iron, magnesium, and calcium ( …   Useful english dictionary

  • Triplit — Chemische Formel (Mn2+,Fe2+)2[(F,OH)|PO4] [1] Mineralklasse Phosphate, Arsenate und Vanadate 8.BB.10 (8. Au …   Deutsch Wikipedia

  • List of minerals S-T (complete) — It is currently not possible to have a complete list of minerals . The International Mineralogical Association is the international group that recognises new minerals and new mineral names, however minerals discovered before 1959 did not go… …   Wikipedia

  • Phosphate minerals — ▪ Table Phosphate minerals name colour lustre Mohs hardness specific gravity amblygonite white to creamy white; slightly tinted vitreous to greasy 5½–6 3.0–3.1 apatite carbonate apatite variable, greens predominating vitreous 5 2.9–3.2… …   Universalium

  • Triploidite — Trip*loi dite, n. (Min.) A manganese phosphate near triplite, but containing hydroxyl instead of fluorine. [1913 Webster] …   The Collaborative International Dictionary of English

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