Harmotome

Field of view: 5 mm. A harmotome vein in sandstone. The short white prisms are harmotome. The cross-shaped crystal at the center is a penetration twin. The surrounding short prisms are single crystals. The dark gray part at the lower right is the host sandstone.

Recovered from an open space of a harmotome vein in sandstone contacting a chert-hosted bedded manganese deposit subjected to Zeolite facies metamorphism.

Harmotome from this location was described in 1951.