Chemistry:Lulzacite
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| Lulzacite | |
|---|---|
 Lulzacite found in France | |
| 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) (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 |
| |re|er}} | 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) 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][5]
References
- ↑ 1.0 1.1 "Lulzacite Mineral Data". webmineral.com. David Barthelmy. http://webmineral.com/data/Lulzacite.shtml. Retrieved September 4, 2010.
- ↑ 2.0 2.1 "Lulzacite". mindat.org. Jolyon Ralph and Ida Chau. http://www.mindat.org/min-7058.html. Retrieved September 4, 2010.
- ↑ 3.0 3.1 3.2 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. doi:10.1016/S1251-8050(00)00152-X. Bibcode: 2000CRASE.330..317M.
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A.
- ↑ "Jamesite". mindat.org. Jolyon Ralph and Ida Chau. http://www.mindat.org/min-2071.html. Retrieved September 4, 2010.
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