Armstrongite

Armstrongite (CaZr[Si6O15]·3H2O)[2] is a silicate mineral.

Armstrongite
Armstrongite found in Mongolia
General
CategoryPhyllosilicate
Formula
(repeating unit)
CaZr[Si6O15]·3H2O
IMA symbolAsg[1]
Strunz classification9.EA.35
Crystal systemMonoclinic
Identification
ColorDark to light brown
CleavagePerfect on {001}, good on {100}
TenacityVery brittle
Mohs scale hardness4.5
LusterVitreous
StreakBrownish white
DiaphaneityTranslucent
References[2]

Discovery and occurrence

It was first described in 1973 from an occurrence at Dorozhnyi pegmatite, Khanbogd District, Ömnögovi Province, Mongolia.[3] It was named for the American astronaut Neil Armstrong.

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. Armstrongite on Mindat.org
  3. Vladykin, N. V.; Kovalenko, V. I.; Kashaev, A. A.; Sapozhnikov, A. N.; Pisarskaya, V. A. (1973). "A new silicate of calcium and zirconium – armstrongite". Doklady Akademii Nauk SSSR. 209: 1185–1188.
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