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note: Specific Gravity of Merrillite-(Ca) =3.03 gm/cc. Help on Fermion Index: ... Print or Cut-and-Paste your Merrillite-(Ca) Specimen Label here : ...
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Empirical Formula: Ca18Na2Mg2(PO4)14. Help on Environment: Environment: Extraterrestrial bodies. The name merrillite was proposed in 1917. ...
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Merrillite (Ca9MgNa(PO4)7), whitlockite (Ca9MgH(PO4)7) and apatite ... Merrillite, the anhydrous Ca-phosphate, usually has an extraterrestrial origin, ...
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In unsubstituted merrillite (assuming no Na or REE substituents for Ca), the interstitial complex has a formula of [Ca19(PO4)2]32+, and in whitlockite, the terrestrial phase in which hydrogen is accommodated, the interstitial unit has the formula [Ca18(PO3[OH])2]32+, yielding the charge-balancing relationship [H(whit) Ca0...
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Ca+Na (atoms per 56 O atoms) in lunar and martian merrillite. Same data as in a. Regression equation is for only the lunar data points, excluding the most ...
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Classification of Merrillite ... Occurrences of Merrillite ... Ca(Fe...
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Merrillite-(Y) mineral data, information about Merrillite-(Y), its properties and worldwide locations. ... This page provides mineralogical data about Merrillite-(Y).
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Other grains are composed of Cr-pleonaste, Ca-rich olivine, pleonaste, and merrillite, along with minor troilite and kamacite. While kirschsteinite is present in most angrites, it has not been observed in this one.
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Accessory minerals include Mg-kirschsteinite, hercynitic spinel, merrillite, NiFe, troilite, celsian, baddelyite and Ti-magnetite. ... They consist primarily of a pigeonite (Ca-poor) pyroxene and a Ca-rich feldspar.
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Ca-rich pyroxene, 6 vol. %; troilite, 4.5 vol. %; metal (taenite only), 3.5 vol. %; chromite, 2 vol. %. Very homogeneous; silicate compositional range is within the analytical precision of ± 0.2 mol %. Orthopyroxene, Fs18.9Wo2.3, Fe/Mn = 41; ... chromite, diopside and merrillite all <1; olivine is greatly enhanced and metal...
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