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Minerals - Beryllonite | TerraCollect

Mineral - Beryllonite

BerylloniteNaBe[PO₄]

Chemical Properties

Mineral Class

Phosphates

Toxicity

none

Formula

NaBe[PO₄]

Unit Cell

a=8.18 b=7.82 c=14.11 β=90° Z=12

Physical Properties

Hardness

5.5 - 6

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

colorless

Birefringence

0.009

Luster

Vitreous,

Adamantine

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

monoclinic

Point Group

Composition

Elements

Mass

P₂O₅

55.86

BeO

19.84

Na₂O

23.64

Maine (Palache at al. 1952)

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Perfect after {010}, distinct after {100}, indistinct after {101}

Fracture

uneven

Tenacity

Brittle

monoclinic-prismatic - 2/m

Space Group

P21/c (14)

Habit

blocky, prismatic, tabular

Formation

Secondary, due to late magmatic, hydrothermal alteration of primary phosphates in granitic and alkaline pegmatites

Paragenesis

Twinning

Contact- and penetration-twins after {101}, pseudohexagonal twins after {110} and {100}

Rarity

Rarely

Synonyms

Beryllonite