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Tvrdýite
About
Group Parent:
Beraunite Group
Type Locality
Huber Stock, Krásno , Horní Slavkov, Bohemia, Czech Republic
Mineral Data
Fe
2+
Fe
2
3+
Al
3
(PO
4
)
4
(OH)
5
(H
2
O)
4
·2H
2
O
Isostructural with:
Beraunite
Physical Properties
Colour:
Silvery to olive-greyish-green
Crystal System:
Monoclinic
Streak:
Greyish-white
Hardness:
3 - 4
Tenacity:
Very brittle
Synonyms
Synonyms:
IMA2014-082
