Gaylussite Mineral Data

Gaylussite Mineral Data +

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General Gaylussite Information

Chemical Formula:

Na2Ca(CO3)2·5(H2O)

Composition:

Molecular Weight = 296.15 gm

Sodium 15.53 % Na 20.93 % Na₂O

Calcium 13.53 % Ca 18.94 % CaO

Hydrogen 3.40 % H 30.42 % H₂O

Carbon 8.11 % C 29.72 % CO₂

Oxygen 59.43 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaNa₂(CO₃)₂·5(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1826

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the French chemist and physicist, J. L. Gay-Lussac (1778-1850).

Synonym:

Gay Lussite

Natrocalcite

Gaylussite Image

Images:

Gaylussite

Comments: Clear, nearly colorless crystals of gaylussite.
Location: Trona, Searles Lake, San Bernardino County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gaylussite Crystallography

Axial Ratios:

a:b:c =1.4897:1:1.4406

Cell Dimensions:

a = 11.589, b = 7.779, c = 11.207, Z = 4; beta = 102° V = 988.24 Den(Calc)= 1.99

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/a

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

By Intensity(I/I_o): 3.205(1), 6.407(0.57), 2.635(0.54),

Forms:

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Forms: [ 0 0 1] [ 0 1 1] [ 1 1 2] [ 0 1 1] [ 1 1 0] [ 1 1 0]

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Crystal Structure:

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Dickens B , Brown W E , Inorganic Chemistry , 8 (1969) p.2093-2103, The crystal structures of CaNa2(CO3)2*5(H2O), synthetic gaylussite,, and CaNa2(CO3)2*2(H2O), synthetic pirssonite, Locality: synthetic

Physical Properties of Gaylussite

Cleavage:

[110] Perfect, [001] Indistinct

Color:

Colorless, Gray, Gray white, Yellow, Yellowish white.

Density:

1.93 - 1.99, Average = 1.96

Diaphaniety:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luminescence:

None.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gaylussite

Gladstone-Dale:

CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2483,KPDmeas= 0.2521,KC= 0.2457

Optical Data:

Biaxial (-), a=1.444, b=1.5155, g=1.523, bire=0.0790, 2V(Calc)=34, 2V(Meas)=34. Dispersion relatively strong.

Calculated Properties of Gaylussite

Electron Density:

r_electron=2.04 gm/cc
note: r_Gaylussite=1.99 gm/cc.

Fermion Index

Fermion Index = 0.00136
Boson Index = 0.99864

Photoelectric:

PE_Gaylussite= 2.06 barns/electron
U=PE_Gaylussite x r_electron= 4.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gaylussite is Not Radioactive

Gaylussite Classification

Dana Class:

15.2.2.1 (15)Hydrated Carbonates

(15.2)where A+m B++n (XO3)p · x(H2O), (m+n):p > 1:1

(15.2.2)Dana Group

15.2.2.1 Gaylussite Na2Ca(CO3)2·5(H2O) I2/a 2/m

Strunz Class:

V/D.02-60 V - Nitrates, Carbonates and Borates

V/D - Water-bearing carbonates without unfamiliar anions

V/D.02 - Thermonatrite - Chalconatronite series

V/D.02-10 Thermonatrite Na2CO3·(H2O) P ca2₁ mm2

V/D.02-20 Natron Na2CO3·10(H2O) Cc m

V/D.02-30 Trona Na3(CO3)(HCO3)·2(H2O) I2/a 2/m

V/D.02-40 Baylissite K2Mg(CO3)2·4(H2O) P 2₁/a 2/m

V/D.02-50 Pirssonite Na2Ca(CO3)2·2(H2O) F dd2 mm2

V/D.02-60 Gaylussite Na2Ca(CO3)2·5(H2O) I2/a 2/m

V/D.02-70 Chalconatronite Na2Cu(CO3)2·3(H2O) P 2₁/n 2/m

Other Gaylussite Information

References:

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

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Gaylussite

Na2Ca(CO3)2·5(H2O)
Dana No: 15.2.2.1 Strunz No: V/D.02-60
Locality:

Notes: