Zykaite
Zykaite or zýkaite is a grey-white mineral consisting of arsenic, hydrogen, iron, sulfur and oxygen with formula: Fe3+4(AsO4)3(SO4)(OH)·15(H2O). This dull mineral is very soft with a Mohs hardness of only 2 and a specific gravity of 2.5. It is translucent and crystallizes in the orthorhombic crystal system.

Its common associates include limonite, gypsum, scorodite, quartz and arsenopyrite. It is found in the Czech Republic, Poland and Germany.

Zykaite was first described in 1978 for an occurrence in the Safary mine, Kutná Hora, Bohemia, Czech Republic and named in honour of Vaclav Zyka (born 1926), a Czech geochemist.
Q7946
mineral
Concept
Q871
arsenic
Concept
Q556
hydrogen
Concept
Q677
iron
Concept
Q682
sulfur
Concept
Q629
oxygen
Concept
Q41472
Mohs hardness
Concept
Q11027905
specific gravity
Concept
Q487623
translucent
Concept
Q648961
orthorhombic
Concept
Q898786
crystal system
Concept
None
associates
UNK
Q193565
limonite
UNK
Q82658
gypsum
Concept
Q425546
scorodite
Concept
Q43010
quartz
Concept
Q191939
arsenopyrite
Concept
Q213
Czech Republic
LOC
Q36
Poland
LOC
Q183
Germany
LOC
Q39193
Bohemia
LOC
Q213
Czech Republic
LOC
None
Vaclav Zyka
UNK
Q161764
geochemist
Concept
Q248885
Zykaite
Concept
Q248885
Zykaite
Concept
1978-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1978
DATE
1926-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1926
DATE
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
++4^^http://www.w3.org/2001/XMLSchema#decimal
+4
NUMBER
+4^^http://www.w3.org/2001/XMLSchema#decimal
4
NUMBER
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
+4^^http://www.w3.org/2001/XMLSchema#decimal
4
NUMBER
+15^^http://www.w3.org/2001/XMLSchema#decimal
15
NUMBER
+2^^http://www.w3.org/2001/XMLSchema#decimal
2
NUMBER
+2^^http://www.w3.org/2001/XMLSchema#decimal
2
NUMBER
+2.5^^http://www.w3.org/2001/XMLSchema#decimal
2.5
NUMBER
crystal system
instance of
country