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Minerals - Brewsterite-(Sr) | TerraCollect

Mineral - Brewsterite-(Sr)

Brewsterite-(Sr)(Sr,Ba,Ca)[Al₂Si₆O₁₆] · 5H₂O

Chemical Properties

Mineral Class

Silicates

Toxicity

none

Formula

(Sr,Ba,Ca)[Al₂Si₆O₁₆] · 5H₂O

Unit Cell

a=6,79 b=17,57 c=7,76 β=95° Z=2

Physical Properties

Hardness

5

Streak

white

Density

Normal (2-3,5)

Optical Properties

Color

whitebrownyellowcolorless

Birefringence

0,014

Luster

Vitreous

Transparency

transparent

Pleochroism

0,014

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

SiO₂

54,4

Al₂O₃

15,3

Fe₂O₃

0,1

CaO

1,2

SrO

9,0

BaO

6,8

Na₂O

0,2

Cleavage

perfekt nach {010}

Fracture

uneven

Tenacity

monoclinic

Point Group

Space Group

Habit

coarse, crusty, prismatic

Formation

hydrothermal in Amygdulen vulkanischer Gesteine und Schiefern

Paragenesis

Twinning

Parallel nach {010}

Rarity

Rather rare

Synonyms

Brewsterite-(Sr), Brewsterite

K₂O

0,1

H₂O

13,2

Schottland

Groups and Members

Zeolith-Gruppe

BRE-Zeolith-Strukturgruppe

Brewsterit-Serie