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The chemical formula of mineral Armstrongite is indicated by CaZrSi6O15•3(H2O). Armstrongite is not a lunar mineral. It is usually associated with alkalic rocks. It is most commonly found at its type of locality at Khan-Bogdin massif, Mongolia. This mineral was named for Neil Alden Armstrong, (1930-), American astronaut, first human being on the moon’s surface, Apollo 11 Lunar Mission. Armstrongite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis. 

             Armstrongite is commonly found showing perfect cleavage in one direction and distinct in the other which can be seen more clearly exhibited when viewed with the aid of polarizing microscope used in the field of optical mineralogy. Armstrongite is usually found colored light brown or reddish brown in hand sample. The specific gravity measure of mineral Armstrongite is usually found ranging from 2.7 to 2.71 grams per cubic centimeters. Most crystals of mineral Armstrongite are found translucent in appearance. Mineral Armstrongite is usually found translucent in appearance. Armstrongite is commonly found showing brittle fracture that is generally displayed by glasses and most non-metallic minerals. The crystal habit of mineral Armstrongite as described in the field of optical mineralogy usually includes aggregates that are made of numerous individual crystals or clusters. Sometimes it can be found bladed forming aggregates of thin lath-like crystals. Sometimes it can be found spherical, rounded aggregates. The hardness measure of mineral Armstrongite when it is evaluated using the Mohs scale method is usually found 4.5. Mineral Armstrongite is commonly found showing vitreous or glassy luster when viewed in reflected light of polarized microscopes. It is also most commonly found leaving brownish streak when rubbed on white porcelain streak plate. Armstrongite is usually found showing biaxial negative figure when evaluated between crossed nicols of petrographic polarizing microscope for mineralogists. It also shows 0.0100 birefringence. Armstrongite is pleochroic showing colorless appearance. Armstrongite is a non-radioactive mineral as evaluated.



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Wednesday, June 30th, 2010 at 1:32 am
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Optical Mineralogy
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