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Karwowskiite, Casub.9sub.7—A New Merrillite Group Mineral from Paralava of the Hatrurim Complex, Daba-Siwaqa, Jordan
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Karwowskiite, Casub.9sub.7—A New Merrillite Group Mineral from Paralava of the Hatrurim Complex, Daba-Siwaqa, Jordan
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Journal Article
Karwowskiite, Casub.9sub.7—A New Merrillite Group Mineral from Paralava of the Hatrurim Complex, Daba-Siwaqa, Jordan
2024
Overview
Crystals of karwowskiite, Ca[sub.9]Mg(Fe[sup.2+] [sub.0.5]□[sub.0.5])(PO[sub.4])[sub.7], a new mineral of the merrillite group, were found on an amygdule wall in the central part of an anorthite–tridymite–diopside paralava of the Hatrurim Complex, Daba-Siwaqa, Jordan. The amygdule was filled with a sulfide melt, which after crystallization gave a differentiated nodule, consisting of troilite and pentlandite parts and containing tetrataenite and nickelphosphide inclusions. Karwowskiite crystals are colorless, although sometimes a greenish tint is observed. The mineral has a vitreous luster. The microhardness VHN[sub.25] is 365 (12), corresponding to 4 on the Mohs hardness scale. Cleavage is not observed, and fracture is conchoidal. The calculated density is 3.085 g/cm[sup.3]. Karwowskiite is uniaxial (−): ω = 1.638 (3), ε = 1.622 (3) (λ = 589 nm), and pleochroism is not observed. The composition of karwowskiite is described by the empirical formula: Ca[sub.9.00](□[sub.0.54]Fe[sup.2+] [sub.0.23]Mg[sub.0.12]Na[sub.0.04] Sr[sub.0.03] Ni[sub.0.03]K[sub.0.01]) [sub.Σ1.00]Mg[sub.1.00](PO[sub.4])[sub.7.02]. Karwowskiite is distinct from the known minerals of the merrillite subgroup with the general formula A[sub.9]XM[TO[sub.3](Ø)][sub.7], where A = Ca, Na, Sr, and Y; X = Na, Ca, and □; M = Mg, Fe[sup.2+], Fe[sup.3+], and Mn; T = P; and Ø = O, in that the X site in it is occupied by Fe[sup.2+] [sub.0.5]□[sub.0.5]. Karwowskiite is trigonal, space group R-3c with a = 10.3375 (2) Å, c = 37.1443 (9) Å, and V = 3437.60 (17) Å[sup.3]. Karwowskiite crystallizes at temperatures lower than 1100 °C in a thin layer of secondary melt forming on the walls of amygdules and gaseous channels in paralava as a result of contact with heated gases which are by-products of the combustion process.
Publisher
MDPI AG
Subject
