Back Lavendulana Catalan Lavendulan German Λαβενδουλάνης Greek Labandulana Basque Lavendulan French Lavendulano Italian Лавендулан Russian
| Lavendulan | |
|---|---|
 | |
| General | |
| Category | Arsenate mineral |
| Formula | NaCaCu5(AsO4)4Cl·5H2O |
| IMA symbol | Lvd[1] |
| Strunz classification | 8.DG.05 |
| Dana classification | 42.9.4.2 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | P21/n[2] |
| Identification | |
| Formula mass | 1,062.00 g/mol |
| Color | Blue or greenish blue |
| Crystal habit | Thin botryoidal crusts of minute radiating fibers or thin rectangular, pseudo-orthorhombic plates[3][2] |
| Twinning | Common[2] |
| Cleavage | Good on {010}, distinct on {100} and {001} |
| Fracture | Uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 2+1⁄2[2][4][5] 2+1⁄2 to 3[3] |
| Luster | Vitreous to waxy, satiny in aggregates |
| Streak | Light blue |
| Diaphaneity | Translucent |
| Specific gravity | 3.54[2][4][5] 3.84[3] |
| Optical properties | Biaxial (−), nearly uniaxial (−) |
| Refractive index | Nx = 1.645 Ny = 1.715 Nz = 1.725[3] Nx = 1.660 Ny = 1.715 Nz = 1.734[2] |
| Pleochroism | O = pale blue to pale greenish blue, E = blue to greenish blue |
| Solubility | Easily soluble in hydrochloric acid[6] |
| Other characteristics | Not radioactive |
| References | [3][2][4][5] |
Lavendulan is an uncommon arsenate mineral in the lavendulan group. It is known for its characteristic intense electric blue colour. Lavendulan is very similar to Lemanskiite, the analogue trihydrate mineral, to the point of them being considered dimorphs. Lemanskiite is tetragonal, but lavendulan is monoclinic.[7] Lavendulan has the same structure as sampleite, and the two minerals form a series.[8] It is the calcium analogue of zdenĕkite and the arsenate analogue of sampleite.
Lavendulan was originally named for the lavender color of the "type" specimen, which has since been determined to be a mixture with no relationship to modern lavendulan. The mineral which is now called lavendulan is not a lavender blue color, and has no relationship to the "type" material from Annaberg.[2] It often contains potassium, cobalt and nickel as impurities.[3]
- ^ 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.
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AM9was invoked but never defined (see the help page). - ^ Ondrus, P.; Veselovsky, F.; Skala, R.; Sejkora, J.; Pazout, R.; Fryda, J.; Gabasova, A.; Vajdak, J. (1 April 2006). "LEMANSKIITE, NaCaCu5(AsO4)4Cl{middle dot}5H2O, A NEW MINERAL SPECIES FROM THE ABUNDANCIA MINE, CHILE". The Canadian Mineralogist. 44 (2): 523–531. doi:10.2113/gscanmin.44.2.523.
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