All crystals damaged, but one face remains showing striation.
A few crystals, one big (6mm) showing heavy twinning.
|Mineral class||Sulphides : Chalcopyrite - Bornite broup|
|Habitus||Small flat tetraedic crystals, often twinned and with striations on the crystal faces. More often as massive or grainy aggregates.|
|Cleavage||Poor, uneven to conchoidal cleavage.|
|Color||Yellow, deeper than pyrite. Often with irisdescent tarnish.|
|Description||One of the most important ores of copper.|
|Occurance||Forms with sulphide ores, in hydrothermal veins, in magmatic rocks. More rarely in pegmatites or metamorphic rocks.|
|Associates||Pyrrhotite, quartz, calcite, pyrite, sphalerite, galena.|
|Notes||Soluble in nitric acid. Colors a flame green.|
|Locations|| A very common mineral with a number of mines in Sweden,
primarily in Bergslagen and Skellefteå field. Crystals are more rare but can also be found. |
| To sulphides index.
|| Mineral group index.
If you have some questions, suggestions or comments you are welcome to write me a line or two.