Armstrongite

Armstrongite
Armstrongite
General
Category	Phyllosilicate
Formula; (repeating unit)	CaZr[Si6O15]·3H2O
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	[1]

Armstrongite (CaZr[Si₆O₁₅]·3H₂O)[1] is a silicate mineral.

Discovery and occurrence

It was first described in 1973 from an occurrence at Dorozhnyi pegmatite, Khanbogd District, Ömnögovi Province, Mongolia.[2] It was named for the American astronaut Neil Armstrong.

References

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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[Mindat-1] Armstrongite on Mindat.org

[2] 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.