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Formula: CdO
Simple oxide of cadmium, forms a series with
lime
Crystal System: Isometric
Specific gravity: 8.1 to 8.2 measured, 8.21 calculated
Hardness: 3
Colour: Yellow-brown, red-brown, brown-black, black (lustrous); red to orange-brown in transmitted light
Solubility: Readily soluble in hydrochloric acid
Environments
Localities
At the type locality, the Monteponi Mine, Iglesias, South Sardinia Province, Sardinia, Italy, monteponite forms
a black coating over hemimorphite. The coating was composed of sharp
octahedrons to less than 0.5 mm on edge
(Mindat, Dana).
At Unnamed marble quarries, Tulul al Hammam, Siwaga, Lisdan-Siwaga Fault, Hashem region, Daba-Siwaqa complex,
Transjordan Plateau, Amman Governorate, Jordan, monteponite was found in altered pyrometamorphic rocks
(HOM).
At the Yana River Basin, Verkhoyansk District, Sakha, Russia, monteponite was found in sulphide ore associated
with cadmium and otavite
(HOM).
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