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Alstonite

Pictures (11 Images total)

Alstonit
Views (File:
1425326407
): 2021
Alstonit
Sechseckige bipyramidale farblose Kristalle auf Calcit , BB = 5,4 mm; Fundort: Dolyhir Quarry, Wethel, Old Radnor, Powys (Radnorshire), Wales, UK.
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A032562, Donator: Neil Hubbard
Location: UK/Wales/Powys (Radnorshire)/Old Radnor/Wethel/Dolyhir Quarry
Mineral: Alstonite
Image: 1425326407
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Alstonit (SNr: A032562)

Sechseckige bipyramidale farblose Kristalle auf Calcit , BB = 5,4 mm; Fundort: Dolyhir Quarry, Wethel, Old Radnor, Powys (Radnorshire), Wales, UK.

Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2015-03-02
Locality: Dolyhir Quarry / Wethel / Old Radnor / Powys (Radnorshire) / Wales / UK
Alstonit xx
Views (File:
1111085519
): 2359
Alstonit xx
Kristalle bis 3 mm; Fundort: Fallowfields Mine, Hexham, Northumberland, England, UK
Copyright: Peter Haas; Contribution: Mineralienatlas
Location: UK/England/Northumberland Co./Tyne Valley/Acomb/Fallowfield Mine
Mineral: Alstonite
Image: 1111085519
Rating: 7.67 (votes: 3)
License: Usage for Mineralienatlas project only
Alstonit xx

Kristalle bis 3 mm; Fundort: Fallowfields Mine, Hexham, Northumberland, England, UK

Copyright: Peter Haas
Contribution: Mineralienatlas 2005-03-17
Locality: Fallowfield Mine / Acomb / Tyne Valley / Northumberland Co. / England / UK
Alstonit
Views (File:
1271434640
): 1196
Alstonit
Bildbreite: 3 mm, Fundort: Brownley Hill Mine, Alston Moor District, North Pennines, Cumbria, England, UK.
Copyright: Richard De Nul; Contribution: thdun5
Location: UK/England/Cumbria Co./Eden, District/Alston Moor, Parish/Nent Valley/Nenthead/Brownley Hill Mine
Mineral: Alstonite
Image: 1271434640
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Alstonit

Bildbreite: 3 mm, Fundort: Brownley Hill Mine, Alston Moor District, North Pennines, Cumbria, England, UK.

Copyright: Richard De Nul
Contribution: thdun5 2010-04-16
Locality: Brownley Hill Mine / Nenthead / Nent Valley / Alston Moor, Parish / Eden, District / Cumbria Co. / England / UK
Alstonit
Views (File:
1359660839
): 1333
Alstonit
Skalenoedrische farblose Kristalle, mehrfach Doppelender, Bildbreite: 12,9 mm, Fundort: Brownley Hill Mine, Alston Moor District, North Pennines, Cumbria, England, UK.
Copyright: Hannes Osterhammer; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A011621, Donator: Manfred Seitz
Location: UK/England/Cumbria Co./Eden, District/Alston Moor, Parish/Nent Valley/Nenthead/Brownley Hill Mine
Mineral: Alstonite
Image: 1359660839
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Alstonit (SNr: A011621)

Skalenoedrische farblose Kristalle, mehrfach Doppelender, Bildbreite: 12,9 mm, Fundort: Brownley Hill Mine, Alston Moor District, North Pennines, Cumbria, England, UK.

Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: Münchener Micromounter 2013-01-31
Locality: Brownley Hill Mine / Nenthead / Nent Valley / Alston Moor, Parish / Eden, District / Cumbria Co. / England / UK
Alstonit
Views (File:
1402910816
): 1073
Alstonit
Alstonit-Kristalle. Fundort: Fallowfield mine, Acomb, Northumberland, England. Bildhöhe: 1,3 mm.
Copyright: Ulrich Baumgärtl; Contribution: raritätenjäger
Collection: Ulrich Baumgärtl
Location: UK/England/Northumberland Co./Tyne Valley/Acomb/Fallowfield Mine
Mineral: Alstonite
Image: 1402910816
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Alstonit

Alstonit-Kristalle. Fundort: Fallowfield mine, Acomb, Northumberland, England. Bildhöhe: 1,3 mm.

Collection: Ulrich Baumgärtl
Copyright: Ulrich Baumgärtl
Contribution: raritätenjäger 2014-06-16
Locality: Fallowfield Mine / Acomb / Tyne Valley / Northumberland Co. / England / UK

You find additional specimen at the Geolitho Museum

Collectors Summary

Color farblos, weiß, gräulich, cremfarben, rosa, usw.
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 4.00 - 4.50
Solubility +++ verdünnte Säuren
Crystal System trigonal, P31m

Chemism

Chemical formula

BaCa(CO3)2

Chemical composition

Barium, Calcium, Kohlenstoff, Sauerstoff

Unit weight: 297.42424 u; Number of atoms in the formula: 10

Info

Empirical formula:

BaCa(CO3)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Carbon

C

8.08

2

20.00

12.0107800

24.0215600

Oxygen

O

32.28

6

60.00

15.9994300

95.9965800

Calcium

Ca

13.48

1

10.00

40.0784000

40.0784000

Barium

Ba

46.17

1

10.00

137.3277000

137.3277000

Analysis wt%

CaO : 17.60, SrO : 4.25, BaO : 48.54, CO2 : 29.41 (Ref: Dana, 7th ed. 2)

Strunz 9th edition incl. updates

5.AB.35

5: Carbonate (Carbonate, Nitrate)
A: Carbonate ohne weitere Anionen, ohne H2O
B: Alkali-Erden- (und andere M2*) Carbonate
35:Alstonit-Gruppe

Lapis Classification

V/B.04-050

V: NITRATE, CARBONATE UND BORATE
B: Wasserfreie Carbonate [CO3] 2-, ohne fremde Anionen
4: Aragonit-Gruppe

Classification by Hölzel

5.AC.255

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
A: Carbonates (-Anions -Water)
C: Carbonates: orthorhombic or monoclinic
2: Double Carbonates

Hey's Chemical Index of Minerals

11.05.04

11: Carbonates
05: Carbonates of Sr and Ba

Dana 8th edition

14.02.05.01

14: Anhydrous Carbonates
02: Anhydrous Carbonates with Compound Formula A+ B++ (CO3)2

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos, weiß, gräulich, cremfarben, rosa, usw.

Streak color

weiß

Diaphaneity (Transparency)

transparent, durchscheinend

Lustre

Glasglanz

max. Birefringence

0.146

Birefringence chart\! Alstonite title=Birefringence chart Alstonite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.526

RI value β

1.671

RI value γ / ε

1.672

Ri mean

1.623

2V angle

Biaxial (-) 6° (gemessen) 9.5 (berechnet)

Orientation

X = c, Y = a, Z = b

Dispersion

Schwach, r > v

Optical Data Luminescence

Color LW-UV (365nm)

 

orangegelb

LW-UV Intensity

schwach

Color SW-UV (254nm)

 

gelblich weiß

SW-UV Intensity

schwach

LW-UV Other Colors

       

gelblich weiß, blassgelb, gelb, gelblich

SW-UV Other Colors

   

blassgelb, gelblich

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

trigonal

Space Group

P31m

Cell parameters a (Å)

17.4360(6)

Cell parameters b (Å)

-

Cell parameters c (Å)

6.1295(2)

Cell parameters a/b or c/a

0.352

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

12

Volume (ų)

1613.799

Crystal structure

Luca Bindi; Andrew C. Roberts; Cristian Biagioni: The crystal structure of alstonite, BaCa(CO3)2: an extraordinary example of ‘hidden’ complex twinning in large single crystals. Mineralogical Magazine Vol. 84, Nr. 5 (2020) S. 699-704.

X-Ray Powder Diffraction

3.55(100),
3.06(10),
2.835(10),
2.507(30),
2.050(20),
1.941(20),
1.846(10),
1.589(10)

XRD chart Alstonite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.00 - 4.50

VHN (Hardness Vickers)

230 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.707 (gemessen)

3.672 ( ρ calc. Mineralienatlas )

Instability

+++ verdünnte Säuren

Preface

Author (Name, Year)

Breithaupt, 1841

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 8

Other languages

German

Alstonit

Spanish

Alstonita

English

Alstonite

French

Alstonite

Russian

Альстонит

Alternative Name

German

Bariumaragonit

Barytocalcite (of Johnston)

Bicalcareocarbonate of Barytes

Bicalcareocarbonate of Barytes

Bromlit

Spanish

Bromlita

English

Bromlite

CNMNC symbol

Symbol

Asn

Locations with GPS information

IDs

GUSID (Global unique identifier short form) poTS1mM0NUyCFXQpSYVyQQ
GUID (Global unique identifier) D6D284A6-3463-4C35-8215-742949857241
Database ID 76