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Minerals - Jeremejevite | TerraCollect

Mineral - Jeremejevite

JeremejeviteAl₆[(F,OH)₃|(BO₃)₅]

Chemical Properties

Mineral Class

Borates

Toxicity

none

Formula

Al₆[(F,OH)₃|(BO₃)₅]

Unit Cell

a=8.56 c=8.18 Z=2

Physical Properties

Hardness

6.5 - 7.5

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

whiteyellowbluecolorless

Birefringence

0.013

Luster

Vitreous

Transparency

transparent

Pleochroism

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

SiO₂

0.03

B₂O₃

33.51

Al₂O₃

59.90

Fe₂O₃

0.01

F

10.18

O=F₂

4.29

Russland (Palache et al. 1952)

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Fracture

conchoidal

Tenacity

Brittle

hexagonal

Point Group

hexagonal-dipyramidal - 6/m

Space Group

P63/m (176)

Habit

acicular, prismatic

Formation

As a late magmatic-hydrothermal mineral in highly fractionated, boron-rich granitic pegmatites through crystallization from residual melts or fluid-rich phases

Paragenesis

Twinning

Rarity

Rarely

Synonyms

Jeremejevite