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Ametista do Sul (São Gabriel), Alto Uruguai region, Rio Grande do Sul, Brazil

Item-No.: MIN6194
Price: 145.00 EUR 
Fluorapatite, Chalcedony
Cerro de Mercado Mine, Victoria de Durango, Cerro de los Remedios, Mun. de Durango, Durango, Mexico

Item-No.: MIN0094
Price: 122.00 EUR 

Synonyms:  Ceracathes, Cerachates, Chalcedone, Chalcedonite, Chalcedononyx, merlinite
Variety of:  Quartz
IMA Status:  Not recognised as mineral
Classification:  Oxides
Chemical formula:  SiO2
Crystal system:  Trigonal - microcrystalline, cryptocrystalline
Density (g/cm3):  2,6 measured
Tenacity:  Brittle
Cleavage:  Non Observed
Fracture:  Conchoidal, Sub-Conchoidal
Hardness (Mohs):  6,5 - 7
Colour:  Colorless, white, gray, blue, any color due to embedded minerals
Lustre:  Waxy, Dull
Streak:  White
First recorded locality:  Kadıköy (Chalcedon), Istanbul Province, Marmara Region, Turkey
Application:  Famous as a semi precious jewelry stone





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