Barytocalcite Mineral Data

Barytocalcite Mineral Data +

General Barytocalcite Information

Chemical Formula:

BaCa(CO3)2

Composition:

Molecular Weight = 297.42 gm

Barium 46.17 % Ba 51.55 % BaO

Calcium 13.48 % Ca 18.85 % CaO

Carbon 8.08 % C 29.59 % CO₂

Oxygen 32.28 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaCa(CO₃)₂

IMA Status:

Valid Species (Pre-IMA) 1824

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named from its chemical composition.

Synonym:

ICSD 36201

PDF 15-285

Barytocalcite Image

Images:

Barytocalcite

Comments: Pale pink crystalline barytocalcite in dark matrix.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Barytocalcite

Comments: White prismatic barytocalcite crystals to 6mm. Former Eaton Collection.
Location: Alston Moor, Cumberland, England. Scale: 3x2x2cm.
© Tom Loomis / Dakota Matrix

Barytocalcite Crystallography

Axial Ratios:

a:b:c =1.5555:1:1.252

Cell Dimensions:

a = 8.134, b = 5.229, c = 6.547, Z = 2; beta = 73.867° V = 267.50 Den(Calc)= 3.69

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.125(1), 3.14(0.9), 4.018(0.4),

Crystal Structure:

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Alm K F , Arkiv for Mineralogi och Geologi , 2 (1960) p.399-410, The crystal structure of barytocalcite BaCa(CO3)2

Physical Properties of Barytocalcite

Cleavage:

[110] Perfect, [101] Perfect, [001] Distinct

Color:

White, Yellow, Gray, Greenish gray.

Density:

3.64 - 3.66, Average = 3.65

Diaphaniety:

Transparent to translucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4 - Fluorite

Luminescence:

None.

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Barytocalcite

Gladstone-Dale:

CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1712,KPDmeas= 0.1731,KC= 0.168

Optical Data:

Biaxial (-), a=1.525, b=1.684, g=1.686, bire=0.1610, 2V(Calc)=10, 2V(Meas)=15. Dispersion relatively weak.

Calculated Properties of Barytocalcite

Electron Density:

r_electron=3.37 gm/cc
note: r_{Barytocalcite}=3.69 gm/cc.

Fermion Index

Fermion Index = 0.08351
Boson Index = 0.91649

Photoelectric:

PE_{Barytocalcite}= 204.28 barns/electron
U=PE_{Barytocalcite} x r_electron= 689.36 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Barytocalcite is Not Radioactive

Barytocalcite Classification

Dana Class:

14.2.6.1 (14)Anhydrous Carbonates

(14.2)with Compound Formula A+ B++ (CO3)2

(14.2.6)Dana Group

14.2.6.1 Barytocalcite BaCa(CO3)2 P 2₁ 2

Strunz Class:

V/B.04-60 V - Nitrates, Carbonates and Borates

V/B - Waterfree carbonates [CO3]2- without unfamiliar anions

V/B.04 - Aragonite group

V/B.04-10 Aragonite CaCO3 Pmcn 2/m 2/m 2/m

V/B.04-20 Strontianite SrCO3 Pmcn 2/m 2/m 2/m

V/B.04-30 Witherite BaCO3 Pmcn 2/m 2/m 2/m

V/B.04-40 Cerussite PbCO3 Pmcn 2/m 2/m 2/m

V/B.04-50 Alstonite BaCa(CO3)2 P1 or P1 Tri

V/B.04-60 Barytocalcite BaCa(CO3)2 P 2₁ 2

V/B.04-65 Olekminskite Sr(Sr,Ca,Ba)(CO3)2 P 3₂1 3 2

V/B.04-70 Paralstonite BaCa(CO3)2 P 3₂1 3 2

Other Barytocalcite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Barytocalcite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Barytocalcite

BaCa(CO3)2
Dana No: 14.2.6.1 Strunz No: V/B.04-60
Locality:

Notes: