... quartz-rich dikes. A comprehensive textural and geochemical characterization of primary phosphate minerals belonging to the triplite-zwieselite, triphylite-lithiophilite, and graftonite-beusite series has been done. Chemical data, including major and trace elements contents, have been obtained...

... with altered triplite–zwieselite and whiteite-(CaMnMn). The measured density (Foote mine) is 2.58(2) g cm −3 . Optically, fanfaniite (Foote mine) is biaxial (–), with α = 1.573(2), β = 1.582(2), γ = 1.585(2) and 2 V (meas) = 57(1)°. Dispersion was not observed. The optical orientation is: Z = b , X ^ c ≈ 40...

... in Germany. At Sitio do Castelo, zincostrunzite was derived from the alteration of triplite–zwieselite. At Hagendorf-Süd, it was found in a nodule of former triphylite that had been replaced by phosphophyllite and minor apatite. At Sitio do Castelo, zincostrunzite occurs as prisms up to 2 mm long...

...). The mineral was found in the Hagendorf Süd granitic pegmatite (Germany) as small (up to 0.5 mm in size) crystals elongated on a and tabular on {010}. The crystals are either simply or polysynthetically twinned on {001}. They crystallize on the walls of voids within altered zwieselite crystals or form coronas...

...I. E. Grey; C. M. Macrae; E. Keck; W. D. Birch Abstract Aluminium-bearing strunzite, [Mn 0.65 Fe 0.26 Zn 0.08 Mg 0.01 ] 2+ [Fe 1.50 Al 0.50 ] 3+ (PO 4 ) 2 (OH) 2 ·6H 2 O, occurs as fibrous aggregates in a crystallographically oriented association with jahnsite on altered zwieselite samples from...

... fractures to form the Cruz del Rayo field of pegmatite dykes, which are hosted by pre-Ordovician low-grade metasedimentary rocks. The increasing activity of phosphorus as magmatic differentiation took place led to the crystallization of primary phosphates, including members of the triplite–zwieselite...

...F ig . 1. Compact, off-white nordgauite in altered pinkish zwieselite–triplite. The main mass is 10 mm across. Note the thin white fibrous rims around the edge of the mass (co-type specimen M51231 ). ...

...F ig . 4. BSE image of whiteite and jahnsite in contact with zwieselite-triplite (Z) and apatite (Ap). ...

...Edward Kostiner Abstract Mossbauer parameters are reported for the phosphate minerals triplite, zwieselite, triploidite, and wolfeite. Analysis of the absorption data confirms the existence of non-equivalent ferrous ions. The broadening of the resonance peaks is rationalized on the basis...

...F igure 3. Time-dependent F K α, P K α, and Mn K α X-ray intensities emitted from a crystal of zwieselite-triplite. Phosphorus and Mn are the most abundant cations of the crystal. Intensities for the three elements are normalized to the relevant zero time values as deduced from a third-order...