Habit: massive.
Color: yellowish green, olive green, greenish black, or reddish brown.
Diaphaneity: transparent to translucent.
Luster: vitreous (i.e., glassy).
Cleavage: (001)
good, (010) distinct.
Fracture: conchoidal, brittle.
Streak: white.
Occurrence: basic and
ultrabasic igneous rocks.
A greenish
rock-forming silicate mineral containing
iron and magnesium. Its clear green form is
the gemstone peridot.
olivine: An important group ofrock-forming silicate minerals crystallizingin the orthorhombic system.Olivine conforms to the general formula(Mg,Fe)2SiO4 and comprises acomplete series from pure magnesiumsilicate (forsterite, Mg2SiO4) topure iron silicate (fayalite, Fe2SiO4). Itis green, brown-green, or yellowgreenin colour. A gem variety ofolivine is peridot.
Slag conditioner, refractories (brick, mortars and monolithic castables), foundry sands.
