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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical composition of mineral Crichtonite is indicated by the formula (Sr,La,Ce,Y)(Ti,Fe+++,Mn)21O38. This mineral is commonly found occurring in alpine-type fissure veins. Crichtonite is most commonly found from its type of locality at St. Christopher, Bourg d’Oisans, Isere, France. Crichtonite was named for Sir Alexander A. Crichton (1763-1856), Scottish physician and mineral collector. Mineral Crichtonite is known to crystallize in the trigonal system of crystal formation. Mineral Crichtonite is commonly found black in hand sample. The density measure of mineral Crichtonite is usually found 4.46 grams per cubic centimeters. Most crystals of mineral Crichtonite are found opaque in appearance. The crystal habit of mineral Crichtonite as described in the field of optical mineralogy usually includes rhombohedral crystals occurring as well-formed crystals showing rhombohedral forms. The hardness measure of mineral Crichtonite is usually found ranging from 5 to 6 when evaluated using the Mohs scale method. Crichtonite is also found showing metallic to dull luster in reflected light of polarizing microscopes. Mineral Crichtonite is also found leaving a dark gray streak when rubbed on white porcelain streak plate. Mineral Crichtonite is also known to have mild radioactivity after chemically evaluated.



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Monday, November 28th, 2011 at 10:38 am
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