Teineite
A variety of Minerals
What is Teineite?
Teineite is a tellurite mineral with the formula Cu(TeO3) . 2 H2O. It has a Moh's hardness of 2.5 and it comes in many different shades of blue, ranging from cerulean blue to bluish-gray. The mineral millsite has the same chemical composition, but crystallizes in the monoclinic system, while teineite crystallizes in the orthorhombic system.
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Key Characteristics
Formation of Teineite
Teineite was first identified in the Teine mine, Sapporo, Hokkaido, Japan, where the name of this mineral originates. It occurs in veins where copper- and tellurium-bearing sulfides were oxidized and is often associated with tellurite, tellurium, pyrite, tetrahedrite, sphalerite, azurite, malachite, quartz, baryte, hessite, galena, bornite, cerussite, chlorargyrite, quetzalcoatlite, cuprite and graemite. It has also been found in other places, including other mines in Japan, several mines in the US and mines in Mexico, Belgium, Russia and Norway.
Quick Facts
Physical Properties
- Color
- Sky-blue, cobalt-blue, bluish gray; bright blue to greenish blue in transmitted light.
- Hardness (Mohs)
- 2.5
- Density
- 3.8 g/cm³
- Streak
- Pale blue
Chemical Properties
- Chemical Formula
- Cu2+(Te4+O3) · 2H2O
- Elements
- Cu, H, O, Te
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