Howieite

  

Origin: Longvale quarry, Mendocino Co., California, U.S.A.

Sample size: 6 x 4 x 3cm with black embedded, acicular crystals to 5 mm

 

  

Ex. Erling Collection

  

Ex. Eaton Collection

  

Black prismatic crystals to 1 cm in flat radial sprays embedded in matrix

Origin: Laytonville quarry, Laytonville, Mendocino Co., , California, United States (type locality)

Sample size: 4.5 x 4 x 1 cm (top), 9 x 8 x 2.5 cm (2nd row), 11 x 7 x 1.5 cm (bottom)

 

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Greenish-black crystals and fibers in schist

Origin: Longvale Quarry, Mendocino Co., California, U.S.A.

Sample size: 4 x 7.5 cm (top), 3.5 x 6 cm (bottom)

 

  

 

Greenish-black crystals and fanning aggregates in schist

Origin: Laytonville quarry, Laytonville, Mendocino Co., California, USA

Sample size: 5 x 9 cm (top), 3.5 x 4 x 8 cm (bottom)

 

Photo courtesy of: