Alamosite

Alamosite
Transparent crystals of alamosite in the matrix of leadhillite and melanotekite
General
CategoryInosilicates
FormulaPb12Si12O36
IMA symbolAam[1]
Strunz classification9.DO.20
Dana classification65.7.1.1
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP2/c
Unit cella = 11.209, b = 7.041
c = 12.22 [Å]; β = 113.15°; Z = 12
Identification
ColorColorless
Cleavage{010} perfect
Mohs scale hardness4.5
LusterAdamantine
StreakWhite
DiaphaneityTransparent to translucent
Specific gravity6.49
Optical propertiesBiaxial (−)
Refractive indexnα = 1.947, nβ = 1.961, nγ = 1.968
Birefringenceδ = 0.021
2V angle65° (meas.)
References[2][3]

Alamosite (Pb12Si12O36) is a colorless silicate mineral named after the place where it was discovered, Álamos, Sonora, Mexico. It is a rare secondary mineral occurring in the oxidized zones of lead-rich deposits. For example, the infobox picture shows its association with black leadhillite.[2]

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. ^ a b Alamosite. Webmineral. Retrieved on 2011-10-10.
  3. ^ Alamosite Mineral Data. Mindat.org. Retrieved on 2011-10-10.


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