Registration via App only

You need a Google Account on your mobilephone, to use TerraCollect on the web. Download the app to set up your minerals, fossils, and rocks – the web portal will then be fully accessible to you. : Download

Are you already register on TerraCollect?

By signing in, you accept the Privacy policy.

Loading data...

Impressum Privacy Policy Sponsors App-Import

0.9.5

Minerals - Alstonite | TerraCollect

Mineral - Alstonite

AlstoniteBaCa(CO₃)₂

Links

Chemical Properties

Mineral Class

Carbonates

Toxicity

none

Formula

BaCa(CO₃)₂

Unit Cell

a=30.14 b=17.40 c=6.12 α=90° β=90° γ=90° Z=24

Physical Properties

Hardness

4 - 4.5

Streak

white

Density

Heavy (3,5-6)

Optical Properties

Color

whitegrayyellowpinkcolorless

Birefringence

0.146

Luster

Vitreous

Transparency

translucent,

transparent

Pleochroism

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

CO₂

29.41

CaO

17.60

SrO

4.25

BaO

48.54

England (Palache et al. 1952)

Map-Layer

Geological MapSatellite Map

Name and first discovery : Named after the type locality in the "Alston Moor district" in Cumbria, England, UK. The mineral was described in 1841 by August Breithaupt.

Chemistry : Polymorphic to monoclinic barytocalcite and trigonal paralstonite

Abbreviation : Asn

literature

Palache, C., Berman, H., & Frondel, C. (1952). Dana's system of mineralogy. Geologiska Föreningen i Stockholm Förhandlingar , 74 (2), 218-219.

Cleavage

Imperfect after {110}

Fracture

uneven

Tenacity

Brittle

triclinic

Point Group

triclinic-pinacoidal - 1

Space Group

P1 (2)

Habit

coarse, dipyramidal, massive, Scalenohedron

Formation

(1) Hydrothermal, by precipitation from low-temperature, barium- and calcium-rich solutions in lead-zinc veins. (2) Primary, as a rare formation in magmatic carbonatites.

Paragenesis

Twinning

Pseudohexagonal twins

Rarity

Rather rare

Synonyms

Alstonite, Bromlite