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Trona Mineral Data

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General Trona Information

Help on Chemical  Formula: Chemical Formula: Na3(CO3)(HCO3)•2(H2O)
Help on Composition: Composition: Molecular Weight = 226.03 gm
   Sodium    30.51 %  Na   41.13 % Na2O
   Hydrogen   2.23 %  H    19.93 % H2O
   Carbon    10.63 %  C    38.94 % CO2
   Oxygen    56.63 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3(HCO3)(CO3)•2(H2O)
Help on Environment: Environment: Non-marine evaporite deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1773
Help on Locality: Locality: Nile Vally near Memphis, Egypt. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From Arabic origins meaning "natron."
Help on Name Pronunciation: Name Pronunciation: Trona Say TRONA
Help on Synonym: Synonym: ICSD 62200
  PDF 29-1447

Trona Image

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  Trona   Nahcolite

Comments: Massive, coarse-grained Trona from a drill core of the upper mixed-layer Saltbed. White areas are nahcolite alteration.
Location: Searles Lake, San Bernardino County, California, USA. Scale: 12 x 15 cm.
© Dave Barthelmy

Trona Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =5.7577:1:2.9504
Help on Cell Dimensions: Cell Dimensions: a = 20.106, b = 3.492, c = 10.303, Z = 4; beta = 103.05° V = 704.69 Den(Calc)= 2.13
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: I2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.647(1), 3.071(0.8), 4.892(0.55),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 1 0 0) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Trona

Help on Cleavage: Cleavage: {100} Perfect, {111} Indistinct, {001} Indistinct
Help on Color: Color: Colorless, Gray white, Grayish, Yellowish, Yellowish white.
Help on Density: Density: 2.11 - 2.17, Average = 2.13
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Fluorescent and Phosphorescent, Short UV=blue-white yellow-orange, Long UV=bright blue white yellow-orange.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Trona

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.226,KPDmeas= 0.2249,KC= 0.2281
Ncalc = 1.48 - 1.49
Help on Optical Data: Optical Data: Biaxial (-), a=1.412, b=1.492, g=1.54, bire=0.1280, 2V(Calc)=70, 2V(Meas)=72. Dispersion relatively strong.

Calculated Properties of Trona

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.15 gm/cc
note: Specific Gravity of Trona =2.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014442381
Boson Index = 0.9985557619
Help on Photoelectric: Photoelectric: PETrona = 0.67 barns/electron
U=PETrona x rElectron Density= 1.45 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Trona is Not Radioactive

Trona Classification

Help on  Dana Class: Dana Class: (13)Acid Carbonates
  (13.01)with miscellaneous formulae
  (13.01.04)Dana Group Trona Na3(CO3)(HCO3)•2(H2O) I2/a 2/m
Help on  Strunz Class: Strunz Class: 05.CB.15 05 - CARBONATES (NITRATES)
  05.C - Carbonates without Additional Anions, with H2O
  05.CB -With large cations (alkali and alkali-earth carbonates)
05.CB.15 Trona Na3(CO3)(HCO3)•2(H2O) I2/a 2/m

Other Trona Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Trona :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - Philatelic Mineralogy
17 - QUT Mineral Atlas
18 - Ruff.Info

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Dana No: Strunz No: 05.CB.15





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