THE MINERAL SJOGRENITE
- Chemistry: Mg6Fe2CO3(OH)16 - 4H2O, Hydrated Magnesium Iron Carbonate Hydroxide.
- Class: Carbonate.
- Group: Manasseite.
- Uses: Only as mineral specimens.
Sjogrenite, which is also spelled sjoegrenite
, is a very rare mineral from the famous mines of
It was discovered there and therefore Langban is called its type locality
Sjogrenite is also found at
New Jersey; Healdsburg, Sonoma County, California and at Kovdor,
Sjogrenite is dimorphous with the mineral
Dimorphs are minerals that share the same chemistry but have different structures.
Sjogrenite is a
hexagonal mineral, while pyroaurite is a
- Color is usually white, yellowish, brownish, greenish to off-white.
- Luster is vitreous to pearly.
- Transparency: Crystals are usually translucent to transparent.
- Crystal System is hexagonal; 6/m 2/m 2/m.
- Crystal Habits include tabular, scaley to platy crystals; also found in fibrous forms.
- Cleavage is perfect in one direction (basal).
- Hardness is 2.5.
- Specific Gravity is 2.1 (very light).
- Streak is white.
- Associated Minerals includes
- Notable Occurrences include the type locality of
Langban, Varmland, Sweden as well as
New Jersey; Healdsburg, Sonoma County, California, USA and at Kovdor,
Kola Peninsula, Russia.
- Best Field Indicators are crystal habits, cleavage, color and locality.