Magnetite

Magnetite is a rock mineral an ane o the main airn ures.

Magnetite
Magnetite frae Bolivie
General
Category	Oxide minerals Spinel group Spinel structural group
Formula (repeatin unit)	iron(II,III) oxide, Fe2+Fe3+2O4
Strunz clessification	4.BB.05
Creestal seestem	Isometric
Creestal cless	Hexoctahedral (m3m) H-M seembol: (4/m 3 2/m)
Space group	Fd3m
Unit cell	a = 8.397 Å; Z = 8
Identification
Colour	Black, gray wi brounish tint in reflectit sun
Creestal habit	Octahedral, fine granular tae massive
Twinnin	On {Ill} as baith twin an composeetion plane, the spinel law, as contact twins
Cleavage	Indistinct, pairtin on {Ill}, verra guid
Fractur	Uneven
Tenacity	Brittle
Mohs scale haurdness	5.5–6.5
Skinkle	Metallic
Streak	Black
Diaphaneity	Opaque
Speceefic gravity	5.17–5.18
Solubility	Dissolves slowly in hydrochloric acid
References	[1][2][3][4]
Major varieties
Lodestane	Magnetic wi definite north an sooth poles