Armstrongite

Armstrongite
Armstrongite
	Armstrongite found in Mongolia
General
Category	Phyllosilicate minerals
Formula	CaZr[Si6O15]·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[Si₆O₁₅]·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.
1 2 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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[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.

[Mindat-2] 1 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.