Tychite Mineral Data

Tychite Mineral Data +

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General Tychite Information

Chemical Formula:

Na6Mg2(CO3)4(SO4)

Composition:

Molecular Weight = 522.65 gm

Sodium 26.39 % Na 35.58 % Na₂O

Magnesium 9.30 % Mg 15.42 % MgO

Carbon 9.19 % C 33.68 % CO₂

Sulfur 6.14 % S 15.32 % SO₃

Oxygen 48.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₆Mg₂(CO₃)₄(SO₄)

Environment:

Continental evaporite deposits.

IMA Status:

Valid Species (Pre-IMA) 1905

Locality:

Searles Lake, San Bernardino Co., California. Link to MinDat.org Location Data.

Synonym:

ICSD 27792

PDF 22-479

Tychite Image

Images:

Tychite

Comments: Nearly transparent tychite crystal.
Location: Searles Lake, San Bernardino County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tychite Crystallography

Cell Dimensions:

a = 13.898, Z = 8; V = 2,684.46 Den(Calc)= 2.59

Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: F d3

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

By Intensity(I/I_o): 2.674(1), 4.187(0.76), 2.459(0.4),

Crystal Structure:

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Schmidt G R , Reynard J , Yang H , Downs R T , Acta Crystallographica, Section E , 62 (2006) p.i207-i209, Tychite, Na6Mg2(SO4)(CO3)4: Structure analysis and Raman spectroscopic data, Locality: Searles Lake, Trona, San Bernardino County, California, USA

View Additional jPOWD Structure files for Tychite
[1] [2]

Physical Properties of Tychite

Cleavage:

None

Color:

Colorless, White.

Density:

2.5

Diaphaniety:

Transparent

Fracture:

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

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Hardness:

3.5 - Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Tychite

Gladstone-Dale:

CI meas= -0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1969,KPDmeas= 0.204,KC= 0.1966

Optical Data:

Isotropic, n=1.51.

Calculated Properties of Tychite

Electron Density:

r_electron=2.56 gm/cc
note: r_Tychite=2.59 gm/cc.

Fermion Index

Fermion Index = 0.011
Boson Index = 0.989

Photoelectric:

PE_Tychite= 1.11 barns/electron
U=PE_Tychite x r_electron= 2.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tychite is Not Radioactive

Tychite Classification

Dana Class:

17.1.1.1 (17)Compound Carbonates

(17.1)with miscellaneous formulae

(17.1.1)Dana Group

17.1.1.1 Tychite Na6Mg2(CO3)4(SO4) F d3 2/m 3

17.1.1.2 Ferrotychite Na6Fe2(SO4)(CO3)4 F d3 2/m 3

17.1.1.3 Manganotychite Na6(Mn,Fe,Mg)2(SO4)(CO3)4 F d3 2/m 3

Strunz Class:

V/C.03-20 V - Nitrates, Carbonates and Borates

V/C - Waterfree carbonates with unfamiliar anions

V/C.03 - Northupite - Ferrotychite series

V/C.03-10 Northupite Na3Mg(CO3)2Cl F d3 2/m 3

V/C.03-20 Tychite Na6Mg2(CO3)4(SO4) F d3 2/m 3

V/C.03-25 Manganotychite Na6(Mn,Fe,Mg)2(SO4)(CO3)4 F d3 2/m 3

V/C.03-30 Ferrotychite Na6Fe2(SO4)(CO3)4 F d3 2/m 3

Other Tychite Information

References:

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

See Also:

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

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Tychite

Na6Mg2(CO3)4(SO4)
Dana No: 17.1.1.1 Strunz No: V/C.03-20
Locality:

Notes: