Picture pending, magnesite from Horstmannaho, Autokumpu area, Finland.
Hard to see, covered in chlorite, but it's half the piece.
|Mineral class||Carbonates : calcite group|
|Habitus||Often massive or grainy. Crystals rhomoedric or prismatic.|
|Density||3.0-3.2 (rising with iron content)|
|Color||Usually colorless or white when pure, gray yellow or brownish nuances when iron is present.|
|Luster||Glas to pearly.|
|Description||Used as base for making cement and fireproof bricks.|
|Occurance|| Magnesite is less common than calcite and is
rarely created as sedimentary rock.|
It often occurs as metasomatic altered rocks, in magnesium rich rock altered by carbonate rich solutions, or carbonatic rock altered by magnesium rich solutions.
|Associates||Talc and serpentinites.|
|Notes|| Magnesite looks like
calcite but is almost not affected by cold hydrochloric acid.
Reacts strongly with hot hydrochloric acid.|
Breunnerite is a name on a magnesite with 5-30% iron
|Locations|| Magnesite have been mined in some places
along the fjelds.|
| To carbonates index.
|| Mineral group index.
If you have some questions, suggestions or comments you are welcome to write me a line or two.