TY - JOUR
T1 - Silicocarnotite, Ca5m[(SiO4)(PO4)](PO4), a new "old" mineral from the Negev Desert, Israel, and the ternesite-silicocarnotite solid solution
T2 - Indicators of high-temperature alteration of pyrometamorphic rocks of the Hatrurim Complex, Southern Levant
AU - Galuskin, Evgeny V.
AU - Galuskina, Irina O.
AU - Gfeller, Frank
AU - Krüger, Biljana
AU - Kusz, Joachim
AU - Vapnik, Yevgeny
AU - Dulski, Mateusz
AU - Dzierzanowski, Piotr
N1 - Publisher Copyright:
© 2015 E. Schweizerbart'sche Verlagsbuchhandlung.
PY - 2016/4/1
Y1 - 2016/4/1
N2 - The new mineral silicocarnotite, Ca5[(SiO4)(PO4)](PO)4 (Pnma; a = 6.72230(1), b = 15.4481(2), c = 10.0847(2) A; V = 1047.37(2) A, Z = 4), has been discovered in pyrometamorphic gehlenite-bearing rocks of the Hatrurim Complex, Negev Desert, Israel. The name "silicocarnotite" has been used for the synthetic phase Ca5[(SiO4)(PO4)](PO)4 for more than 100 years. The holotype specimen is a gehlenite-fluorapatite rock with minor andradite and pseudowollastonite. Silicocarnotite is colourless with a white streak and a vitreous lustre. The microhardness is VHN50 = 523-552 kg m-2, mean = 537 kg m-2. Mohs hardness is about 5. Cleavage and parting are not observed. The calculated density is 3.06 g cm-3. Silicocarnotite is biaxial (+), with a = 1.618(2), β = 1.621(2), γ = 1.628(2) (589 nm), 2V (meas.) = 75(5)o, 2VZ (calc.) = 67o; dispersion is medium, r > v; the orientation is X|| b, Y|| a, Z || c; the mineral is nonpleochroic. The empirical formula of holotype silicocarnotite is Ca5011Sr0.006P1.774 Si1.106S6+0.113O12. The strongest diffraction lines are [dhkl, (I)]: 2.815(100), 2.596(62), 2.575(50), 3.285(48), 3.903(40), 3.007(39), 3.176(36), 1.746(29), 3.082 (29). Minerals of the silicocarnotite-ternesite solid solution, Ca5[(SiO)4(PO4)](PO)4-Ca5(SiO4)2SO4, occur in larnite- and gehlenitebearing pyrometamorphic rocks of the Hatrurim Complex, distributed in the Dead Sea rift area on the territories of Israel, Palestine and Jordan. New data on morphology, composition, structure, mineral associations, mechanisms and conditions of growth of the ternesite-silicocarnotite solid-solution series are presented. Large ternesite porphyroblasts (metacrysts) in fine-grained larnite-ye'elimite matrix are the most striking evidence for high-temperature alterations of early "clinker minerals". Silicocarnotite-ternesite grains grew as a result of reactions between primary pyrometamorphic minerals (larnite, flamite, fluorellestadite-fluorapatite) with sulphate-bearing melts, which are side-products of the combustion processes during the pyrometamorphism.
AB - The new mineral silicocarnotite, Ca5[(SiO4)(PO4)](PO)4 (Pnma; a = 6.72230(1), b = 15.4481(2), c = 10.0847(2) A; V = 1047.37(2) A, Z = 4), has been discovered in pyrometamorphic gehlenite-bearing rocks of the Hatrurim Complex, Negev Desert, Israel. The name "silicocarnotite" has been used for the synthetic phase Ca5[(SiO4)(PO4)](PO)4 for more than 100 years. The holotype specimen is a gehlenite-fluorapatite rock with minor andradite and pseudowollastonite. Silicocarnotite is colourless with a white streak and a vitreous lustre. The microhardness is VHN50 = 523-552 kg m-2, mean = 537 kg m-2. Mohs hardness is about 5. Cleavage and parting are not observed. The calculated density is 3.06 g cm-3. Silicocarnotite is biaxial (+), with a = 1.618(2), β = 1.621(2), γ = 1.628(2) (589 nm), 2V (meas.) = 75(5)o, 2VZ (calc.) = 67o; dispersion is medium, r > v; the orientation is X|| b, Y|| a, Z || c; the mineral is nonpleochroic. The empirical formula of holotype silicocarnotite is Ca5011Sr0.006P1.774 Si1.106S6+0.113O12. The strongest diffraction lines are [dhkl, (I)]: 2.815(100), 2.596(62), 2.575(50), 3.285(48), 3.903(40), 3.007(39), 3.176(36), 1.746(29), 3.082 (29). Minerals of the silicocarnotite-ternesite solid solution, Ca5[(SiO)4(PO4)](PO)4-Ca5(SiO4)2SO4, occur in larnite- and gehlenitebearing pyrometamorphic rocks of the Hatrurim Complex, distributed in the Dead Sea rift area on the territories of Israel, Palestine and Jordan. New data on morphology, composition, structure, mineral associations, mechanisms and conditions of growth of the ternesite-silicocarnotite solid-solution series are presented. Large ternesite porphyroblasts (metacrysts) in fine-grained larnite-ye'elimite matrix are the most striking evidence for high-temperature alterations of early "clinker minerals". Silicocarnotite-ternesite grains grew as a result of reactions between primary pyrometamorphic minerals (larnite, flamite, fluorellestadite-fluorapatite) with sulphate-bearing melts, which are side-products of the combustion processes during the pyrometamorphism.
KW - Calcium silicophosphate
KW - Combustion processes
KW - Crystal structure
KW - Hatrurim Complex
KW - Metacrysts
KW - New mineral
KW - P-bearing ternesite
KW - Pyrometamorphism
KW - Raman
KW - Silicocarnotite
KW - Solid solution
UR - http://www.scopus.com/inward/record.url?scp=84962909964&partnerID=8YFLogxK
U2 - 10.1127/ejm/2015/0027-2494
DO - 10.1127/ejm/2015/0027-2494
M3 - Article
AN - SCOPUS:84962909964
VL - 28
SP - 105
EP - 123
JO - European Journal of Mineralogy
JF - European Journal of Mineralogy
SN - 0935-1221
IS - 1
ER -