todorokite
Sign in to savethumb|Polyhedral representation of the todorokite structure.
Key facts
- Mineral.name
- Todorokite
- Mineral.category
- Manganese minerals
- Mineral.boxwidth
- 24
- Mineral.image
- Manjiroite-Todorokite-Calcite-174093.jpg
- Mineral.caption
- Todorokite with manjioite and calcite from the Smartt Mine, Kuruman District, South Africa
- Mineral.IMAsymbol
- Tdr
- Mineral.molweight
- 583.05 g/mol
- Mineral.strunz
- 4.DK.10 (10 ed) 4/D.09-10 (8 ed)
- Mineral.dana
- 7.8.1.1
- Mineral.system
- Monoclinic
- Mineral.class
- Prismatic (2/m) (same H-M symbol)
- Mineral.symmetry
- P2/m (no. 11)
- Mineral.color
- Dark brown or brownish black, brown in transmitted light
- Mineral.habit
- Aggregates of minute lathlike crystals
- Mineral.twinning
- Contact twins are common
- Mineral.cleavage
- Perfect on {100} and {010}
- Mineral.luster
- Metallic to dull, silky in aggregates
- Mineral.refractive
- Greater than 1.74
via Wikipedia infobox
Article
18 sectionsContents
- Structure
- Unit cell
- Appearance
- Optical properties
- Physical properties
- Solubility
- Other characteristics
- Type locality
- Occurrence and associations
- Other localities
- Austria
- Brazil
- Cuba
- Portugal
- South Africa
- United States
- See also
- References
{{Infobox mineral | name = Todorokite | category = Manganese minerals | boxwidth = 24 | boxbgcolor = | image = Manjiroite-Todorokite-Calcite-174093.jpg | caption = Todorokite with manjioite and calcite from the Smartt Mine, Kuruman District, South Africa | formula = | IMAsymbol = Tdr | molweight = 583.05 g/mol | strunz = 4.DK.10 (10 ed) 4/D.09-10 (8 ed) | dana = 7.8.1.1 | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P2/m (no. 11) | color = Dark brown or brownish black, brown in transmitted light | habit = Aggregates of minute lathlike crystals | twinning = Contact twins are common | cleavage = Perfect on {100} and {010} | fracture = | tenacity = | mohs = | luster = Metallic to dull, silky in aggregates | refractive = Greater than 1.74 | opticalprop = Biaxial | birefringence = nearly 0.02 | pleochroism = X = dark brown, Z = yellowish brown | streak = Black or dark brown | gravity = 3.5 to 3.8 | melt = | fusibility = Does not fuse | diagnostic = | solubility = Soluble in acids | diaphaneity = Opaque, transparent in very thin slivers | other = | references = }}
thumb|Polyhedral representation of the todorokite structure.