Flamite, (Ca,Na,K)2(Si,P)O4, a new mineral from ultrahightemperature combustion metamorphic rocks, Hatrurim Basin, Negev Desert, Israel

E. V. Sokol, Y. V. Seryotkin, S. N. Kokh, Ye Vapnik, E. N. Nigmatulina, S. V. Goryainov, E. V. Belogub, V. V. Sharygin

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Flamite (Ca,Na,K)2(Si,P)O4 (P63; a = 43.3726(18), c = 6.8270(4) Å; V = 11122.2(9) Å3), a natural analogue of the P,Na,K-doped high-temperature α-Ca2SiO4 modification, is a new mineral from Ca-and Al-rich paralava, an ultrahigh-temperature combustion metamorphic melt rock. The type locality is situated in the southern Hatrurim Basin, the Negev Desert, Israel. Flamite occurs as regular lamellar intergrowths with partially hydrated larnite, together with rock-forming gehlenite, rankinite and Ti-rich andradite, minor ferrian perovskite, magnesioferrite, hematite, and retrograde ettringite and calcium silicate hydrates. The mineral is greyish to yellowish, transparent with a vitreous lustre, non-fluorescent under ultraviolet light and shows no parting or cleavage; Mohs hardness is 5-5; calculated density is 3.264 g cm-3. The empirical formula of holotype flamite (mean of 21 analyses) is (Ca1.82Na0.09K0.06(Mg,Fe,Sr,Ba)0.02)∑1.99(Si0.82P0.18)∑1.00O4. The strongest lines in the powder X-ray diffraction pattern are [d, Å (Iobs )]: 2.713(100), 2.765(44), 2.759(42), 1.762(32), 2.518(29), 2.402(23), 2.897(19), 1.967(18), 2.220(15), 1.813(15). The strongest bands in the Raman spectrum are 170, 260, 520, 538, 850, 863, 885, 952 and 1003 cm-1.

Original languageEnglish
Pages (from-to)583-596
Number of pages14
JournalMineralogical Magazine
Volume79
Issue number3
DOIs
StatePublished - 1 Jan 2015

Keywords

  • (CA,NA,K)(SI,P)O
  • Combustion metamorphism
  • Dicalcium silicate
  • Flamite
  • Hatrurim basin
  • Larnite
  • New Mineral
  • α-CASIO

ASJC Scopus subject areas

  • Geochemistry and Petrology

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