The Wolframite Group Properties

Property	ferberite	wolframite	huebnerite
Picture
formula	FeWO4	(Fe, Mn)WO4	MnWO4
WO3 content (%)	76.3	76.5	76.6
Mn content (%)	0 - 3.6	3.6 - 14.5	14.5 - 18.1
Fe content (%)	18.4 - 14.7	14.7 - 3.7	3.7 - 0
specific gravity	7.5gr/cc	7.1 - 7.5 gr/cc	7.2 - 7.3 gr/cc
form	well defined crystals	irregular groups of radiating crystals	radiating thin crystals
color	black	dark grey to black	red-brown to black
luster	submetallic to metallic	submetallic to metallic	submetallic to adamantine
diaphaneity	opaque to translucent	opaque	opaque to translucent
streak	dark brown	dark brown	red-brown to green-yellow
crystal structure	monoclinic	monoclinic	monoclinic
cleavage	1 direction, perfect	1 direction, perfect	1 direction, perfect
fracture	uneven	uneven	uneven
hardness	5 Mohs	5 -5.5 Mohs	5 Mohs
magnetism	feeble	slight	none