FAYALITE
Specimen fay-1

Dims:4.1x2.8x2.1" (10.4x7.1x5.3 cm)

Wt: 11.0oz. (313g)

Little Lake, California

In a cavity in altered obsidian (perlite), a tiny crystal of fayalite rests on a bed of cristobalite crystals. The nature of this specimen prevents one from getting a good look at the fayalite crystal. The perlite matrix is set in a chunk of unaltered obsidian. There is no damage to this piece. It is an interesting specimen.

Dims:1.2x0.9x0.9" (3.0x2.3x2.3 cm)

Wt: 0.5oz. (14g)

Little Lake, California

This specimen consists of a partial nodule of altered obsidian (perlite) on which rests at least five tiny bladed crystals of fayalite among many nodules of cristobalite. Not enough of the crystals are exposed to get a really good look at the orthorhombic form, but the crystal faces that do show are extremely translucent. The matrix of this specimen has been sawn through on one side. There is no damage to this specimen.

Dims:2.0x1.7x1.0" (5.1x4.3x2.5 cm)

Wt: 1.2oz. (34g)

Summit Rock, Oregon

The many cavities in the scoria matrix of this specimen are host to several dark, tabular crystals of fayalite. This particular type of fayalite is called hortonolite. There does not appear to be any damage to the fayalite crystals.