Corundum (var. Sapphire)
Tanzania - Africa
Al2O3
Description
Perfect, well terminated, sharp-edged, lustrous green and blue crystal with a color intensity varying along the length.
Umba River, Tanga Province
Collection of origin
Houston Museum (USA)
From the Tamil kuruntam, which probably came from the Sanskrit kuruvinda for ruby, and the Latin sapphīrus which comes from the Greek sappheiros, which may have come in turn from a Semitic word meaning blue-colored stone.
Class
4 - Oxides and Hydroxides / Oxides
Dimensions (length x with x height in cm)
2.5x3x5.5
Hardness (Mohs)
9
Density (G/cm3)
4.1
Publication
"Mineralogical Record: Jan-Feb 1992"
