Armstrongite
(repeating unit)CaZr[Si6O15]·3H2O IMA symbol Asg[1] Strunz classification 9.EA.35 Crystal system Monoclinic Identification Color Dark to light brown Cleavage Perfect on {001}, good on {100} Tenacity Very brittle Mohs scale hardness 4.5 Luster Vitreous Streak Brownish white Diaphaneity Translucent References [2]
Armstrongite (CaZr[Si6O15]·3H2O)[2] is a silicate mineral.
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
- ^ 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.
- ^ a b Armstrongite on Mindat.org
- ^ 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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