Rodalquilarite is a rare iron tellurite chloride mineral with formula H3Fe3+2(Te4+O3)4Cl[2] or Fe2(TeO2OH)3(TeO3)Cl.[3] Rodalquilarite crystallizes in the triclinic system and typically occurs as stout green prisms and encrustations.
| Rodalquilarite | |
|---|---|
 Rodalquilarite crystals from a cavity in alunite | |
| General | |
| Category | Tellurite mineral |
| Formula (repeating unit) | H3Fe3+2(Te4+O3)4Cl |
| IMA symbol | Raq[1] |
| Strunz classification | 4.JL.05 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) (same H-M symbol) |
| Space group | P1 |
| Unit cell | a = 8.95 Å, b = 5.09 Å c = 6.63 Å; α = 103.17° β = 107.08°, γ = 77.87°; Z = 1 |
| Identification | |
| Color | Emerald- to grass-green |
| Crystal habit | Crusts of stout crystals |
| Cleavage | One good cleavage plane |
| Tenacity | Very brittle |
| Mohs scale hardness | 2 - 3 |
| Luster | Greasy |
| Streak | Greenish yellow |
| Diaphaneity | Semitransparent |
| Specific gravity | 4.97 - 5.15 |
| Optical properties | Biaxial (-) |
| Refractive index | nα = 2.100 nγ = 2.200 |
| Birefringence | δ = 0.100 |
| 2V angle | 38° |
| References | [2][3][4] |
Discovery and occurrence
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Rodalquilarite was first described in 1968 for an occurrence in the Rodalquilar gold deposit of Almeria, Spain and was named for the discovery locality. It has also been reported from the Wendy open pit mine, El Indio-Tambo district, Coquimbo Region of Chile and the mines of Tombstone, Arizona.[2] It is found in the oxidized zone of tellurium-bearing gold deposits. It occurs associated with emmonsite, native gold, alunite, jarosite, quartz, native tellurium, mackayite and sonoraite.[2]
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 c d Rodalquilarite in the Handbook of Mineralogy
- ^ a b Rodalquilarite on Mindat.org
- ^ Rodalquilarite data on Webmineral