Rodalquilarite
Rodalquilarite is a rare iron tellurite chloride mineral with formula H3Fe3+2(Te4+O3)4Cl[1] or Fe2(TeO2OH)3(TeO3)Cl.[2] 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 |
| 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 | [1][2][3] |
Discovery and occurrence
Green rodalquilarite crystals in a vug in pink alunite from Chile
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.[1] 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.[1]
gollark: It's weird how my username's color looks pretty different on my phone to my laptop
gollark: They ignore the real world's apiohazards.
gollark: WRONG. My haskell code is PERFECT and PURE because I never declare `main`.
gollark: Internals are impure.
gollark: In an ideal world, you would just tell haskell what you want and it would produce a beautiful codebase for you to marvel at, then compile ultra-optimized platform machine code for whatever you want.
References
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.