Teepleite Mineral Data

General Teepleite Information

Chemical Formula:

Na2B(OH)4Cl

Composition:

Molecular Weight = 160.27 gm

Sodium 28.69 % Na 38.67 % Na₂O

Boron 6.74 % B 21.72 % B₂O₃

Hydrogen 2.52 % H 22.48 % H₂O

Chlorine 22.12 % Cl 22.12 % Cl

- % Cl -4.99 % -O=Cl₂

Oxygen 39.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂B(OH)₄Cl

Environment:

Continental evaporate deposits.

IMA Status:

Valid Species (Pre-IMA) 1939

Locality:

Borax lake, SE edge of Clear Lake, Lake Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for John Edgar Teeple (1874-1931), for his work on the chemistry of Searles Lake brines, Trona, California, USA.

Name Pronunciation:

Teepleite + Pronunciation

Synonym:

ICSD 32518

PDF 12-Nov

Teepleite Image

Images:

Teepleite

Comments: Tan bladed crystals teepleite on massive halite.
Location: Borax Lake, Lake County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Teepleite Crystallography

Axial Ratios:

a:c = 1:0.66804

Cell Dimensions:

a = 7.26, c = 4.85, Z = 2; V = 255.63 Den(Calc)= 2.08

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm

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

By Intensity(I/I_o): 2.697(1), 2.015(0.9), 2.9(0.8),

Forms:

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

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Crystal Structure:

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Effenberger H , Acta Crystallographica, Section B , 38 (1982) p.82-85, Verfeinerung der kristallstruktur von synthetischem teepleit, Locality: synthetic

Physical Properties of Teepleite

Cleavage:

{???} Indistinct

Color:

Colorless, White.

Density:

2.076

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Teepleite

Gladstone-Dale:

CI meas= 0.076 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2457,KPDmeas= 0.2461,KC= 0.2665
Ncalc = 1.55

Optical Data:

Uniaxial (-), e=1.503, w=1.519, bire=0.0160.

Calculated Properties of Teepleite

Electron Density:

Bulk Density (Electron Density)=2.07 gm/cc
note: Specific Gravity of Teepleite =2.08 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Teepleite= 2.00 barns/electron
U=PE_Teepleite x rElectron Density= 4.14 barns/cc.

Radioactivity:

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

Teepleite Classification

Dana Class:

25.01.04.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.01)Dana Type

(25.01.04)Dana Group

25.01.04.01 Teepleite Na2B(OH)4Cl P 4/nmm 4/m 2/m 2/m

25.01.04.02 Bandylite CuB(OH)4Cl P 4/nmm 4/m 2/m 2/m

Strunz Class:

06.AC.40 06 - BORATES

06.A - Monoborates

06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.

06.AC.40 Teepleite Na2B(OH)4Cl P 4/nmm 4/m 2/m 2/m

Other Teepleite 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 Teepleite :
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 Teepleite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Teepleite

Na2B(OH)4Cl
Dana No: 25.01.04.01 Strunz No: 06.AC.40
Locality:

Notes: