Armstrongite
Armstrongite (CaZr[Si6O15]·3H2O)[2] is a silicate mineral.
| Armstrongite | |
|---|---|
 Armstrongite found in Mongolia | |
| General | |
| Category | Phyllosilicate |
| Formula (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] |
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.
- 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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