About Todorokite
A complex hydrated manganese oxide with a tunnel structure, typically black and earthy or fibrous. It's a stone of transformation and grounding, aiding in releasing negativity. (Important component of manganese nodules).
Primary Hues
Black, Brownish-Black, Steel-Grey, often forms fibrous, botryoidal, or earthy masses
Geological & Scientific Details
Todorokite is classified as a manganese minerals mineral which typically crystallizes in the monoclinic system. Its chemical formula is (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2O. Common crystal habits include aggregates of minute lathlike crystals.
Key Geological Properties:
- Mineral Category: Manganese minerals
- Chemical Formula: (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2O
- IMA Symbol: Tdr[2]
- Crystal System: Monoclinic
- Formula Mass (g/mol): 583.05 g/mol
- Predominant Geological Color: Dark brown or brownish black, brown in transmitted light
- Crystal Habit: Aggregates of minute lathlike crystals
- Twinning: Contact twins are common
- Cleavage: Perfect on {100} and {010}
- Luster: Metallic to dull, silky in aggregates
- Streak: Black or dark brown
- Diaphaneity: Opaque, transparent in very thin slivers
Associated Minerals
- Birnessite
- Pyrolusite
- Romanechite
- Psilomelane
- Cryptomelane
- Hollandite