Silicates: Gehlen
Diagnostic Card.
Ca 2 Al (Si, Al) 2 O 7
Crystal system tetragonal
Hardness 5-6
The proportion of 3
Color white, light yellow, light green, gray, light brown
Gloss fat
It distributed in the form of aggregates of fine crystals having a tabular-prismatic shape. Painting white, light yellow, light green and greyish-light brown. Gloss fat.
Diagnostic features.
It gives a gelatinous residue when exposed to hydrochloric acid. It melts only at very high temperatures.
Origin.
Gehlen found in igneous basic rocks rich in calcium, in metamorphosed limestone and metallurgical slags.
Place of Birth.
Gehlen presented in Oravice in Banat (Romania), Durango (Mexico) in Riverside County, California (USA). In Italy, found in limestone Monzoni Val di Fassa (province of Trento), where it is also called Fugger.
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Toxic and hazardous radioactive rocks and minerals
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