Pitchstone
Photographed by Michael P. Klimetz

Dugway Pass

Juab County
UTAH
Photographed by Michael P. Klimetz

Dugway Pass

Juab County
UTAH
Photographed by Michael P. Klimetz

Dugway Pass

Juab County
UTAH
Photographed by Michael P. Klimetz

Dugway Pass

Juab County
UTAH
Photographed by Michael P. Klimetz

Dugway Pass

Juab County
UTAH
Photographed by Michael P. Klimetz

Dugway Pass

Juab County
UTAH
Photographed by Michael P. Klimetz

Dugway Pass

Juab County
UTAH
Pitchstone is a dull black to brown mixed aphanitic to glassy volcanic rock, rich in microscopic crystallites, formed from rapidly quenched felsic lava or magma. It is similar to obsidian but is defined as having a higher water content. Pitchstone qualifies as a volcanic glass. However, unlike a glass, pitchstone has an irregular, hackly fracture and not a conchoidal fracture. That is due to its microcrystalline (aphanitic) texture. Pitchstone has a resinous to silky appearance and a variable composition. Its color may be mottled, streaked, or uniform brown, red, green, gray, or black. It is very hard and hence resistant to abrasion and erosion.