Global InformationAjoite information
| Ajoite | |
|---|---|
 Ajoite from Arizona, United States. Image by Henk Smeets. | |
| General | |
| Category | Silicate mineral |
| Formula (repeating unit) | (Na,K)Cu7AlSi9O24(OH)6·3H2O |
| IMA symbol | Aj[1] |
| Strunz classification | 9.EA.70 (10 ed) 8/D.07-10 (8 ed) |
| Dana classification | 78.05.01.011 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) (same H-M symbol) |
| Space group | P1 |
| Unit cell | a = 13.63, b = 14.5 c = 13.62 [Å]; α = 107.16° β = 105.45°, γ = 110.57°; Z = 1 |
| Identification | |
| Color | Bluish green |
| Crystal habit | Sprays of bladed prismatic crystals |
| Cleavage | Perfect on {010} |
| Mohs scale hardness | 3+1⁄2[2] |
| Luster | Vitreous |
| Streak | Greenish white |
| Diaphaneity | Translucent |
| Specific gravity | 2.96 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.550, nβ = 1.583, nγ = 1.641 |
| Birefringence | δ = 0.091 |
| Pleochroism | X: very light bluish green; Y and Z: brilliant bluish green |
| 2V angle | Measured: 68° to 80° |
| Solubility | Decomposed by acids |
| References | [3][4][5][6] |
Ajoite is a hydrated sodium potassium copper aluminium silicate hydroxide mineral. Ajoite has the chemical formula (Na,K)Cu7AlSi9O24(OH)6·3H2O,[6] and minor Mn, Fe and Ca are usually also present in the structure.[3] Ajoite is used as a minor ore of copper.
- ^ 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.
- ^ Ajoite Archived 2008-07-25 at the Wayback Machine. Mineral Galleries
- ^ a b Gaines, et al (1997) Dana's New Mineralogy, Eighth Edition. Wiley
- ^ Ajoite. Mindat.org (2011-08-16). Retrieved on 2011-10-09.
- ^ Ajoite. Webmineral.com. Retrieved on 2011-10-09.
- ^ a b Ajoite. Handbook of Mineralogy. Retrieved on 2011-10-09.