# psilomelane

> hard black manganese oxides (romanechite, mainly)

**Wikidata**: [Q419315](https://www.wikidata.org/wiki/Q419315)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Psilomelane)  
**Source**: https://4ort.xyz/entity/psilomelane


## References

1. Freebase Data Dumps. 2013
2. KBpedia
3. GF WordNet