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Lulzacite

Summary

Lulzacite is a strontium-containing phosphate mineral with the chemical formula Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10.[2][3]

Lulzacite
Lulzacite found in France
General
CategoryPhosphate minerals
Formula
(repeating unit)		Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10
IMA symbolLul[1]
Strunz classification8.BK.25
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Identification
ColorGrayish-green to yellowish-green
Crystal habitAnhedral aggregates; rarely small euhedral crystals
CleavageNone
Mohs scale hardness5.5–6
LusterVitreous
DiaphaneityTransparent–translucent
Specific gravity3.55
Optical propertiesBiaxial (−)
Refractive indexnα = 1.654
nβ = 1.674
nγ = 1.684
Birefringenceδ = 0.030
References[2][3][4]

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.[4]

Lulzacite crystallizes in the triclinic system with P1 space group. It is isostructural with jamesite (Pb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10).[4][5]

References edit

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b "Lulzacite Mineral Data". webmineral.com. David Barthelmy. Retrieved September 4, 2010.
  3. ^ a b "Lulzacite". mindat.org. Jolyon Ralph and Ida Chau. Retrieved September 4, 2010.
  4. ^ 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'Académie des Sciences, Série IIA. 330 (5): 317–324. Bibcode:2000CRASE.330..317M. doi:10.1016/S1251-8050(00)00152-X.
  5. ^ "Jamesite". mindat.org. Jolyon Ralph and Ida Chau. Retrieved September 4, 2010.