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Alstonite

Pictures (11 Images total)

Alstonit
Views (Image: 1425326407): 1627
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 (Image: 1111085519): 2180
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 (Image: 1271434640): 1052
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 (Image: 1359660839): 1185
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 (Image: 1402910816): 950
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
Alstonit xx auf Fluorit und Calcit
Views (Image: 1107127879): 1021
Alstonit xx auf Fluorit und Calcit

Bildbreite 15mm; Fundort: Minerva Mine, Cave-in-Rock, Hardin Co., Illinois, USA

Copyright: Alan Goldstein
Contribution: Mineralienatlas 2005-01-31
Locality: Minerva No. 1 Mine (Ozark Mahoning No.1) / Cave-in-Rock / Cave-in-Rock Sub-District / Illinois-Kentucky Fluorspar District / Hardin Co. / Illinois / USA

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

Volumne (ų)

1613.799

Kristall 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

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Alstonite

BaCa(CO3)2

trigonal : P31m

5.AB.35

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Aragonite

CaCO3

orthorhombisch : mmm : Pmcn

V/B.04-010

Strontianite

SrCO3

orthorhombisch : mmm : Pmcn

V/B.04-020

Witherite

BaCO3

orthorhombisch : mmm : Pmcn

V/B.04-030

Cerussite

PbCO3

orthorhombisch : mmm : Pmcn

V/B.04-040

Alstonite

BaCa(CO3)2

trigonal : P31m

V/B.04-050

Barytocalcite

BaCa(CO3)2

monoklin : 2/m : P21/m

V/B.04-060

Olekminskite

Sr(Sr,Ca,Ba)(CO3)2

trigonal : 32 : P321

V/B.04-065

Paralstonite

BaCa(CO3)2

trigonal : 32 : P321

V/B.04-070

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Nyerereite

Na2Ca(CO3)2

orthorhombisch : mm2 : Cmc21

5.AC.200

'Natrofairchildite'

Na2Ca(CO3)2

5.AC.210

Shortite

Na2Ca2(CO3)3

orthorhombisch : mm2 : Amm2

5.AC.220

Carbocernaite

(Ca,Na)(Sr,Ce,Ba)(CO3)2

orthorhombisch : mm2 : Pmc21

5.AC.230

Barytocalcite

BaCa(CO3)2

monoklin : 2/m : P21/m

5.AC.250

Alstonite

BaCa(CO3)2

trigonal : P31m

5.AC.255

Sahamalite-(Ce)

(Mg,Fe2+)Ce2(CO3)4

monoklin : 2/m : P21/a

5.AC.260

Petersenite-(Ce)

(Na,Ca)4(Ce,La,Nd,Sr)2(CO3)5

monoklin : 2 : P21

5.AC.270

Rémondite-(Ce)

Na3(Ce,Ca,Na)3(CO3)5

monoklin : 2 : P21

5.AC.280

Rémondite-(La)

Na3(La,Ca,Na)3(CO3)5

monoklin : 2 : P21

5.AC.285

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Dolomite

CaMg(CO3)2

trigonal : 3 : R3

14.02.01.01

Ankerite

Ca(Fe2+,Mg,Mn)(CO3)2

trigonal : 3 : R3

14.02.01.02

Kutnohorite

CaMn2+(CO3)2

trigonal : 3 : R3

14.02.01.03

Minrecordite

CaZn(CO3)2

trigonal : 3 : R3

14.02.01.04

Norsethite

BaMg(CO3)2

trigonal : 3m : R3m

14.02.02.01

Paralstonite

BaCa(CO3)2

trigonal : 32 : P321

14.02.02.02

Olekminskite

Sr(Sr,Ca,Ba)(CO3)2

trigonal : 32 : P321

14.02.02.03

Benstonite

(Ba,Sr)6(Ca,Mn)6Mg(CO3)13

trigonal : 3 : R3

14.02.03.01

Ewaldite

Ba(Na,Ca,Y,Ce,K)(CO3)2·2.6H2O

hexagonal : 6mm : P63mc

14.02.04.01

Alstonite

BaCa(CO3)2

trigonal : P31m

14.02.05.01

Barytocalcite

BaCa(CO3)2

monoklin : 2/m : P21/m

14.02.06.01

Related minerals "Hey's Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Alstonite

BaCa(CO3)2

trigonal : P31m

11.05.04

Alternative Name

German

Bariumaragonit

Barytocalcite (of Johnston)

Bicalcareocarbonate of Barytes

Bicalcareocarbonate of Barytes

Bromlit

Spanish

Bromlita

English

Bromlite

CNMNC symbol

Symbol

Asn

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Alstonit
Google-Bilder-Suche - search for: Alstonit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Alstonit

English pages

Mindat - search for: Alstonite
Webmineral - search for:Alstonite
Handbook-of-Mineralogy - search for: Alstonite
RRUFF - Raman, XRD and other mineral data - search for: Alstonite
RRUFF - References and PDF downloads - search for: Alstonite
American-Mineralogist-Crystal-Structure-Database - search for: Alstonite
Athena - search for: Alstonite

Russian pages

Webmineral.ru - search for: Альстонит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Alstonit
Crystal-Treasure.com - search for: Alstonit
Bosse - search for: Alstonit

Locations with GPS information