Lulzacite

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Lulzacite
General
Category Phosphate minerals
Formula
(repeating unit)
Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10
Strunz classification 8.BK.25
Crystal system Triclinic
Crystal class Pinacoidal (1)
Identification
Color Grayish-green to yellowish-green
Crystal habit Anhedral aggregates; rarely small euhedral crystals
Crystal symmetry Triclinic
H-M symbol: (1)
Space group: P1
Cleavage None
Mohs scale hardness 5.5–6
Luster Vitreous
Diaphaneity Transparent–translucent
Specific gravity 3.55
Optical properties Biaxial (−)
Refractive index nα = 1.654
nβ = 1.674
nγ = 1.684
Birefringence δ = 0.030
References [1][2][3]

Lulzacite is a strontium-containing phosphate mineral with the chemical formula Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10.[1][2]

The mineral was first described in 2000 from quartzite deposits (47°42′50″N 1°29′20″W / 47.71389°N 1.48889°W / 47.71389; -1.48889) at Saint-Aubin-des-Châteaux, Loire-Atlantique, France, and is named after Y. Lulzac, a French geologist who discovered the mineral. In this deposit, lulzacite occurs within quartz and siderite veinlets at quartzite–limestone contacts. Other minerals found in the veinlets include apatite, goyazite, and pyrite.[3]

Lulzacite crystallizes in the triclinic system with P1 space group. It is isostructural with jamesite (Pb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10).[3][4]

References[edit]

  1. ^ a b "Lulzacite Mineral Data". webmineral.com. David Barthelmy. Retrieved September 4, 2010. 
  2. ^ a b "Lulzacite". mindat.org. Jolyon Ralph and Ida Chau. Retrieved September 4, 2010. 
  3. ^ a b c Moëlo, Yves; Bernard Lasnier; Pierre Palvadeau; Philippe Léone; François Fontan (15 March 2000). "Lulzacite, Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10, a new strontium phosphate (Saint-Aubin-des-Châteaux, Loire-Atlantique, France).". Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science. 330: 317–324. Bibcode:2000CRASE.330..317M. doi:10.1016/S1251-8050(00)00152-X. 
  4. ^ "Jamesite". mindat.org. Jolyon Ralph and Ida Chau. Retrieved September 4, 2010.