Lulzacite

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Lulzacite
General
Category Phosphate minerals
Formula
(repeating unit)
Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10
Strunz classification 08.BK.25
Identification
Color Grayish-green to yellowish-green
Crystal habit Anhedral aggregates; rarely small euhedral crystals
Crystal system Triclinic (pinacoidal)
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

  1. 1.0 1.1 "Lulzacite Mineral Data". webmineral.com. David Barthelmy. Retrieved September 4, 2010. 
  2. 2.0 2.1 "Lulzacite". mindat.org. Jolyon Ralph and Ida Chau. Retrieved September 4, 2010. 
  3. 3.0 3.1 3.2 Moëlo, Yves; Bernard Lasnier, Pierre Palvadeau, Philippe Léone, and 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: 317324. 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. 


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