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Akantiitti
From Wikipedia, the free encyclopedia
Akantiitti on hopeasulfidin (Ag2S) muoto. Se on tässä muodossa, kun lämpötila on alle tietyn rajan (noin +170 °C). Tätä korkeammassa lämpötilassa akantiitti muuttuu argentiitiksi.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Acanthite_-_Imiter_mine%2C_Jbel_Saghro%2C_Tinghir%2C_Dr%C3%A2a-Tafilalet%2C_Morocco.jpg/640px-Acanthite_-_Imiter_mine%2C_Jbel_Saghro%2C_Tinghir%2C_Dr%C3%A2a-Tafilalet%2C_Morocco.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Acanthite_-_Chispas_Mine%2C_Arizpe%2C_Sonora%2C_Mexico.jpg/640px-Acanthite_-_Chispas_Mine%2C_Arizpe%2C_Sonora%2C_Mexico.jpg)
Akantiitin väri vaihtelee harmaasta teräksenmustaan. Viirun väri on musta. Sen kovuus on Mohsin kovuusasteikolla 2–2,5.