Merwinite

Merwinite Location: Crestmore Quarry, Riverside County, California, USA. Copyright: © Jeff Weissman / Photographic Guide to Mineral Species

Chemical Formula: Ca3Mg(SiO4)2
Locality: Crestmore quarry, 5 miles NW of Riverside, Riverside Co., California.
Name Origin: Herbert Eugene Merwin (1878-1963), American mineralogist and petrologist, Carnegie Institute, Washington, D.C., USA.

History

Discovery date : 1921
Town of Origin : CARRIERE WET WEATHER, CRESTMORE, RIVERSIDE, CALIFORNIE
Country of Origin : USA

Optical properties

Optical and misc. Properties: Transparent to translucent
Refractive Index: from 1,70 to 1,72
Axial angle 2V : 66-76°

Physical Properties

Cleavage: {010} Perfect
Color:     Colorless, Gray, Pale green.
Density: 3.15
Diaphaneity: Transparent to translucent
Fracture: Brittle – Generally displayed by glasses and most non-metallic minerals.
Hardness: 6 – Orthoclase
Luminescence: Non-fluorescent.
Luster: Vitreous (Glassy)
Magnetism: Nonmagnetic
Streak: white

Photos :

Mineral: Merwinite in Monticellite-Spurrite Locality: Crestmore Quarry, Riverside County, California (Type Locality for Merwinite) Overall Size: 6x4x3 cm Crystals: 1-3 mm © JohnBetts-FineMinerals
Mineral: Merwinite and Plombièrite Locality: Crestmore Quarry, Riverside County, California (Type Locality for Merwinite) Overall Size: 9.5×8.5×4 cm Crystals: 1-3 mm © JohnBetts-FineMinerals
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