Swedenborgite

swedenborgite

richterite

bromellite

hematite

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Formula: NaBe₄Sb⁵⁺O₇
Antimonate, beryllium-bearing mineral
Crystal System: Hexagonal
Specific gravity: 4.285 measured, 4.28 calculated
Hardness: 8
Streak: White
Colour: Colourless, pale wine- to honey-yellow; colourless in transmitted light
Solubility: Insoluble in acids. Decomposed by fusion with Na₂CO₃ or KHSO₄ (Mindat)
Environments:

Metamorphic environments

At the type locality, Långban, Filipstad, Värmland, Sweden, swedenborgite occurs in skarn from a metamorphosed Fe-Mn ore body, associated with richterite, manganoan biotite, hematite, calcite and bromellite (Mindat).

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