General Information:
Chemical Formula:CaZrSi6O15·3(H2O)
Composition:(Molecular Weight = 593.85 gm)Calcium 6.75 %
CaZirconium 15.36 %
ZrSilicon 28.38 %
SiHydrogen 1.02 %
H Oxygen 48.50 %
O Empirical Formula: CaZrSi6O15·3(H2O)
Environment:Not a lunar mineral. Associated with alkalic rocks.
IMA Status:Approved IMA 1973
Locality:TL:Khan-Bogdin massif, Mongolia.
Name Origin:Named for Neil Alden Armstrong, (1930-), American astronaut, first human being on the moon's surface, Apollo 11 Lunar Mission.
Physical Properties: Cleavage:[001] Perfect, [100] Distinct
Color:light brown or reddish brown.
Density:2.7 - 2.71, Average = 2.7
Habits:Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Spherical - Spherical, rounded aggregates., Aggregates - Made of numerous individual crystals or clusters.
Hardness:4.5 - Between Fluorite and Apatite
Luster:Vitreous (Glassy)
Streak:brownish white
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