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Bertrandite

A species of Minerals

Bertrandite is a beryllium sorosilicate hydroxide mineral with composition: Be4Si2O7(OH)2. Bertrandite is a colorless to pale yellow orthorhombic mineral with a hardness of 6-7. It is commonly found in beryllium rich pegmatites and is in part an alteration of beryl. Bertrandite often occurs as a pseudomorphic replacement of beryl. Associated minerals include beryl, phenakite, herderite, tourmaline, muscovite, fluorite and quartz. It, with beryl, are ores of beryllium. It was discovered near Nantes, France in 1883 and named after French mineralogist, Emile Bertrand (1844–1909). One of the world's largest deposits of bertrandite is Spor Mountain, Thomas Range, Utah which is currently the source of most of the world's beryllium production.

Hardness:

6 - 7

Density:

2.61 g/cm³

General Info About Bertrandite

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Physical Properties of Bertrandite

Colors

Colourless, pale yellow

Streak

White

Hardness

6 - 7 , Hard

Density

2.61 g/cm³, Normal Weight

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Chemical Properties of Bertrandite

Formula

Be₄(Si₂O₇)(OH)₂

Elements listed

Be, H, O, Si

Common Impurities

Al,Fe,Ca

Optical Properties of Bertrandite

Refractive Index

1.583-1.614

Optical Character

Biaxial negative

Characteristics of Bertrandite

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