| Armstrongite | |
|---|---|
 Armstrongite found in Mongolia | |
| General | |
| Category | Phyllosilicate |
| Formula (repeating unit) | CaZr·3H2O |
| IMA symbol | Asg |
| 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 | |
Armstrongite (CaZr·3H2O) is a silicate mineral.
Discovery and occurrence
It was first described in 1973 from an occurrence at Dorozhnyi pegmatite, Khanbogd District, Ömnögovi Province, Mongolia. 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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