Allactite
Allactite is a rare manganese arsenate described by Stens Anders Hjalmar Sjogren in 1884 and obtains its name from a Greek word meaning "to change," referring to its marked pleochroism in transmitted light. It occurs as prismatic, translucent, brown, brownish-red, purplish-red, to off-white crystals elongate [010], or bladed and tabular on {100}, with a variety of forms producing complex, wedge-like crystals. Allactite occurs as a rare secondary mineral in veinlets in the metamorphosed manganese deposits at the type locality, Langban, Varmland, Sweden, associated with synadelphite, hematolite, hausmannite, pyrochroite, and fluorite.It is also found in complexly metamorphosed and deformed stratiform zinc ores at Franklin, Sussex Co., New Jersey, USA, associated with pyroaurite, leucophoenicite, hodgkinsonite, adelite, franklinite, willemite, friedelite, caryopilite, and sphalerite. If you're interested in buying allactite mineral specimens, shop online for fine minerals at The Arkenstone.
- VIE18
- Native Lead With Allactite
- Langban, Sweden
- Miniature
- 4.0 x 2.6 x 1.2 cm
- $3,000.00
- RARE16B-139
- Magnussonite with Allactite on Hausmannite-Dolomite ore
- Langban mine, Filipstad, Varmland, Sweden
- Cabinet
- 7.0 x 6.5 x 2.0 cm
- PMRARE15-070
- Allactite (type locality and good crystal) with Pyrochroite
- Moss mine, Nordmark, Filipstad, Varmland, Sweden
- Cabinet
- 9.0 x 6.5 x 4.5 cm