Shortite Mineral Data

Shortite Mineral Data +

General Shortite Information

Chemical Formula:

Na2Ca2(CO3)3

Composition:

Molecular Weight = 306.16 gm

Sodium 15.02 % Na 20.24 % Na₂O

Calcium 26.18 % Ca 36.63 % CaO

Carbon 11.77 % C 43.12 % CO₂

Oxygen 47.03 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca₂(CO₃)₃

Environment:

Associated with trona.

IMA Status:

Valid Species (Pre-IMA) 1940

Locality:

Drill cores from the Green River formation, Wyoming and Utah. Link to MinDat.org Location Data.

Name Origin:

Named for Maxwell Naylor Short (1889-1952), professor of mineralogy, University of Arizona.

Synonym:

ICSD 16495

PDF 21-1348

Shortite Image

Images:

Shortite

Comments: Colorless crystal of shortite on matrix.
Location: Green River Formation, Sweetwater Co., Wyoming, USA. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Shortite

Comments: Triangular shortite crystal in kerogenaceous dolomitic marlstone from the saline zone in the Green River Formation.
Location: Green River, Sweetwater Co., Wyoming, USA. Scale: Crystal Size 2 mm.
© Tom Loomis / Dakota Matrix

Shortite Crystallography

Axial Ratios:

a:b:c =0.4497:1:0.6455

Cell Dimensions:

a = 4.961, b = 11.03, c = 7.12, Z = 2; V = 389.61 Den(Calc)= 2.61

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Amm2

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

By Intensity(I/I_o): 2.562(1), 4.96(0.7), 5.52(0.7),

Forms:

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Crystal Structure:

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Dickens B , Hyman A , Brown W E , Journal of Research of the National Bureau of Standards - Physics and Chemistry , 75A (1971) p.129-135, Crystal structure of Ca2Na2(CO3)3 (shortite), Note: Y- and z-coordinates of Ca adjusted to match reported bond lengths

Physical Properties of Shortite

Cleavage:

[010] Distinct

Color:

Colorless, Light yellow.

Density:

2.6

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Shortite

Gladstone-Dale:

CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2115,KPDmeas= 0.2123,KC= 0.2064

Optical Data:

Biaxial (-), a=1.531, b=1.555, g=1.57, bire=0.0390, 2V(Calc)=74, 2V(Meas)=75. Dispersion r < v moderate.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Shortite

Electron Density:

r_electron=2.59 gm/cc
note: r_Shortite=2.61 gm/cc.

Fermion Index

Fermion Index = 0.00187
Boson Index = 0.99813

Photoelectric:

PE_Shortite= 3.61 barns/electron
U=PE_Shortite x r_electron= 9.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Shortite is Not Radioactive

Shortite Classification

Dana Class:

14.4.1.1 (14)Anhydrous Carbonates

(14.4)with Compound Formula A+2 B++2 (CO3)4

(14.4.1)Dana Group

14.4.1.1 Shortite Na2Ca2(CO3)3 Amm2 mm2

Strunz Class:

V/B.05-70 V - Nitrates, Carbonates and Borates

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

V/B.05 - Eitelie - Shortite - Carbocernaite series

V/B.05-10 Eitelite Na2Mg(CO3)2 R 3 3

V/B.05-20 Nyerereite Na2Ca(CO3)2 C mc2₁ mm2

V/B.05-30 Natrofairchildite Na2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

V/B.05-40 Gregoryite (Na2,K2,Ca)CO3 P 6₃mc 6mm

V/B.05-50 Fairchildite K2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

V/B.05-55 Zemkorite (Na,K)2Ca(CO3)2 P 6₃/mmc, P 6₃mc, P 6₂c- Hex

V/B.05-60 Butschliite K2Ca(CO3)2 R 3m 3 2/m

V/B.05-70 Shortite Na2Ca2(CO3)3 Amm2 mm2

V/B.05-80 Sahamalite-(Ce) (Mg,Fe)Ce2(CO3)4 P 2₁/a 2/m

V/B.05-90 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 2₁ 2

V/B.05-92 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 2₁ 2

V/B.05-95 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 2₁ 2

V/B.05-98 Calcioburbankite Na3(Ca,REE,Sr)3(CO3)5 P 6₃mc 6mm

V/B.05-100 Burbankite (Na,Ca)3(Sr,Ba,Ce)3(CO3)5 P 6₃/mmc 6/m 2/m 2/m

V/B.05-110 Khanneshite (NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5 P 6₃mc 6mm

V/B.05-120 Carbocernaite (Ca,Na)(Sr,Ce,Ba)(CO3)2 P mc2₁ mm2

Other Shortite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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Print or Cut-and-Paste your Shortite Specimen Label here :

Shortite

Na2Ca2(CO3)3
Dana No: 14.4.1.1 Strunz No: V/B.05-70
Locality:

Notes: