Northupite Mineral Data

General Northupite Information

Chemical Formula:

Na3Mg(CO3)2Cl

Composition:

Molecular Weight = 248.75 gm

Sodium 27.73 % Na 37.37 % Na₂O

Magnesium 9.77 % Mg 16.20 % MgO

Carbon 9.66 % C 35.39 % CO₂

Chlorine 14.25 % Cl 14.25 % Cl

- % Cl -3.22 % -O=Cl₂

Oxygen 38.59 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₃Mg(CO₃)₂Cl

Environment:

Continental evaporite deposits.

IMA Status:

Valid Species (Pre-IMA) 1895

Locality:

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

Name Origin:

Named after C. H. Northup (b.1861), grocer, of San Jose, California, who found the first specimen.

Name Pronunciation:

Northupite + Pronunciation

Synonym:

ICSD 4237

PDF 19-1213

Northupite Image

Images:

Northupite

Comments: Single octahedron of Northupite.
Location: Searles Lake, San Bernardino County, California, USA. Scale: Grain size 8 mm.
© Dave Barthelmy

Northupite Crystallography

Cell Dimensions:

a = 14.01, Z = 16; V = 2,749.88 Den(Calc)= 2.40

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): 2.48(1), 2.69(1), 8(0.8),

Crystal Structure:

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Dal Negro A , Giuseppetti G , Tadini C , Tschermaks Mineralogische und Petrographische Mitteilungen , 22 (1975) p.158-163, Refinement of the crystal structure of northupite: Na3Mg(CO3)2Cl, Locality: Searles Lake, California, USA

Physical Properties of Northupite

Cleavage:

None

Color:

Brownish, Colorless, Gray, Gray brown, Yellow.

Density:

2.38

Diaphaneity:

Transparent to translucent

Fracture:

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

Habit:

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

Habit:

Pyramidal - Crystals are shaped like pyramids.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

Fluorescent and Phosphorescent, Long UV=bright cream white.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Northupite

Gladstone-Dale:

CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2142,KPDmeas= 0.216,KC= 0.2231
Ncalc = 1.53 - 1.54

Optical Data:

Isotropic, n=1.514.

Calculated Properties of Northupite

Electron Density:

Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Northupite =2.38 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Northupite= 1.70 barns/electron
U=PE_Northupite x rElectron Density= 3.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Northupite is Not Radioactive

Northupite Classification

Dana Class:

16a.03.09.01 (16a)Carbonates - Hydroxyl or Halogen

(16a.03)where (A B)2 (XO3) Zq

(16a.03.09)Dana Group

16a.03.09.01 Northupite Na3Mg(CO3)2Cl F d3 2/m 3

Strunz Class:

05.BF.05 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

05.BF -With (Cl), SO4, PO4, TeO3

05.BF.05 Ferrotychite Na6Fe2(SO4)(CO3)4 F d3 2/m 3

05.BF.05 Manganotychite Na6(Mn,Fe,Mg)2(SO4)(CO3)4 F d3 2/m 3

05.BF.05 Northupite Na3Mg(CO3)2Cl F d3 2/m 3

05.BF.05 Tychite Na6Mg2(CO3)4(SO4) F d3 2/m 3

Other Northupite Information

References:

NAME( Dana8) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Northupite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Northupite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Northupite

Na3Mg(CO3)2Cl
Dana No: 16a.03.09.01 Strunz No: 05.BF.05
Locality:

Notes: