Misplaced Pages

Cacoxenite

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Iron aluminium phosphate mineral
Cacoxenite
Cacoxenite, Minas de Horcajo, Castile-La Mancha, Spain
General
CategoryPhosphate minerals
Formula
(repeating unit)		Fe24Al(PO4)17O6(OH)12·17(H2O)
IMA symbolCac
Strunz classification8.DC.40
Crystal systemHexagonal
Crystal classDipyramidal (6/m)
(same H-M symbol)
Space groupP63/m
Unit cella = 27.559(1) Å,
c = 10.55 Å; Z = 2
Identification
ColorYellow to brownish yellow, reddish orange, golden yellow, deep orange, green; yellow in transmitted light
Crystal habitAcicular, radial, stellate
CleavageNone
FractureUneven
Mohs scale hardness3–4
LusterSilky
StreakWhite
Diaphaneitysemitransparent
Specific gravity2.2–2.6
Optical propertiesUniaxial (+)
Refractive indexnω = 1.575 – 1.585 nε = 1.635 – 1.656
Birefringenceδ = 0.060
Pleochroismvisible: O = Pale yellow E = Canary yellow to yellow orange
References

Cacoxenite is an iron aluminium phosphate mineral with formula: Fe24Al(PO4)17O6(OH)12·17(H2O). Cacoxenite is associated with iron ores. The name comes from the Greek κăκός for "bad" or "evil" and ξένος for "guest" because the phosphorus content of cacoxenite lessens the quality of iron smelted from ore containing it.

It was first described in 1825 for an occurrence in the Hrbek Mine, Bohemia, Czech Republic. It occurs as a secondary phase in oxidized magnetite and limonite deposits. It also occurs in novaculites and in iron and phosphorus rich sediments.

Cacoxenite, 6.2 × 5.4 × 4.1 cm, Fort Lismeenagh, Shanagolden, County Limerick, Ireland

References

  1. 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.
  2. Mineralienatlas
  3. Cacoxenite Mineral Data
  4. ^ Cacoxenite: Cacoxenite mineral information and data
  5. ^ Magdalena, Arya (2019-04-23). "Facts About Cacoxenite: Meanings, Properties, and Benefits". Gemstagram. Retrieved 2021-02-12.
  6. ^ "Cacoxenite: Meanings, Properties and Powers". CrystalsandJewelry.com. 2019-04-30. Retrieved 2021-02-12.
  7. "Cacoxenite". Handbook of Mineralogy. p. 88. PDF File.


Stub icon

This article about a specific phosphate mineral is a stub. You can help Misplaced Pages by expanding it.

Categories: