Lulzacite
Appearance
Lulzacite | |
---|---|
General | |
Category | Phosphate minerals |
Formula (repeating unit) | Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10 |
IMA symbol | Lul[1] |
Strunz classification | 8.BK.25 |
Crystal system | Triclinic |
Crystal class | Pinacoidal (1) (same H-M symbol) |
Space group | P1 |
Identification | |
Color | Grayish-green to yellowish-green |
Crystal habit | Anhedral aggregates; rarely small euhedral crystals |
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 | [2][3][4] |
Lulzacite is a strontium-containing phosphate mineral with the chemical formula Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10.[2][3]
The mineral was first described in 2000 from quartzite deposits (47°42′50″N 1°29′20″W / 47.71389°N 1.48889°W) 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]- ^ 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.
- ^ a b "Lulzacite Mineral Data". webmineral.com. David Barthelmy. Retrieved September 4, 2010.
- ^ a b "Lulzacite". mindat.org. Jolyon Ralph and Ida Chau. Retrieved September 4, 2010.
- ^ 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.
- ^ "Jamesite". mindat.org. Jolyon Ralph and Ida Chau. Retrieved September 4, 2010.