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Properties
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Origin: |
Named after its first known
locality on the river Achates (southern Sicily, Italy) |
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Hardness
(Mohs Scale): |
6-7 |
|
Crystal
System (number of classes) |
Hexagonal |
|
Color: |
Various |
|
Luster: |
Sometimes white,
yellow-green or green |
|
Streak: |
White |
|
Occurrence: |
Widespread,
especially in volcanic areas. |
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