Triplite
A variety of Minerals
What is Triplite?
Triplite is a rare phosphate mineral with formula: (Mn,Fe)2PO4(F,OH). 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.
Optical Properties
- Refractive Index
- 1.643-1.703
- Birefringence
- 0.02
- Pleochroism
- Distinct
- Optical Character
- Biaxial positive
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Triplite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Triplite Localities Map
See where Triplite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Triplite
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.
More Images
Quick Facts
Physical Properties
- Color
- Brown, red-brown, dark brown, black, light brownish-yellow to dark reddish brown in transmitted light
- Hardness (Mohs)
- 5 - 5.5
- Density
- 3.94 g/cm³
- Streak
- White to brown
Chemical Properties
- Chemical Formula
- Mn2+2(PO4)F
- Elements
- F, Mn, O, P
Also Known As
Identify Triplite Instantly
- Snap a photo, get instant results
- 6,700+ rocks, minerals & crystals
- Discover collecting spots near you
Triplite FAQs
How do I identify Triplite?
Triplite can be identified by its hardness of 5 - 5.5 on the Mohs scale, Brown color. Look for these key characteristics when examining specimens.
What color is Triplite?
Triplite typically appears in Brown, red-brown, dark brown, black, light brownish-yellow to dark reddish brown in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Triplite?
Triplite has a hardness of 5 - 5.5 on the Mohs scale. This gives it moderate hardness.
What is the formation of triplite of Triplite?
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.
%252FAbenakiite-(ce)-01.jpg&size=small)
