Specimen #2572

Name: Prehnite on Calcite

Type: Mineral

Locality: Roncari Quarry, East Granby, Hartford County, Connecticut, USA

Favorite? N

Fluorescent? N

Size: 11.5x10x6 cm.

Weight:

Acquired: 2021-12-09

Source: John Betts

Label: N

Comment: Description: Large cluster of translucent green prehnite crystals in hemispherical aggregates to 8 mm diameter on lustrous translucent white rhombohedral calcite crystals to 30 mm. The surfaces of the prehnite balls are composed of many small parallel crystal faces. All crystals are complete and undamaged, except the outer edges where it was attached to surrounding matrix. The calcite fluoresces orange under SW UV. Ex. S. Kelland collection; originally acquired October 2007. Overall size: 11.5x10x6 cm. Size of individual crystals: 3-30 mm

Minerals: Calcite (CaCO₃) Prehnite (Ca₂Al₂Si₃O₁₀(OH)₂)

There are 6 pictures on file

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UV illumination with 254 nm shortwave (SW) ultraviolet illumination

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