Tincalconite Mineral Data

Tincalconite Mineral Data +

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General Tincalconite Information

Chemical Formula:

Na6[B4O5(OH)4]3·8(H2O)

Composition:

Molecular Weight = 855.86 gm

Sodium 16.12 % Na 21.73 % Na₂O

Boron 15.16 % B 48.81 % B₂O₃

Hydrogen 3.30 % H 29.47 % H₂O

Oxygen 65.43 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₆B₁₂O₁₅(OH)₁₂·8(H₂O)

Environment:

Dehydration of borax or other Na borates.

IMA Status:

Valid Species (Pre-IMA) 1878

Locality:

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

Name Origin:

Named for tincal (borax) and konos "powder" in allusion to the minerals composition and appearance.

Synonym:

ICSD 66529

PDF 7-277

Tincalconite Image

Images:

Tincalconite

Comments: Pristine white tincalconite pseudomorph after a single borax crystal.
Location: Boron, Kramer District, Kern Co., California, USA. Scale: 30x14x5 mm.
© John Betts - Fine Minerals

Tincalconite Crystallography

Axial Ratios:

a:c = 1:1.90364

Cell Dimensions:

a = 11.1402, c = 21.207, Z = 3; V = 2,279.27 Den(Calc)= 1.87

Crystal System:

Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: R 32

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

By Intensity(I/I_o): 2.92(1), 4.38(0.9), 3.44(0.55),

Crystal Structure:

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Giacovazzo C , Menchetti S , Scordari F , American Mineralogist , 58 (1973) p.523-530, The crystal structure of tincalconite

View Additional jPOWD Structure files for Tincalconite
[1]

Physical Properties of Tincalconite

Color:

White.

Density:

1.88

Diaphaniety:

Opaque

Habit:

Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Earthy (Dull)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Tincalconite

Dichroism (w):

none.

Gladstone-Dale:

CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2487,KPDmeas= 0.2473,KC= 0.2464

Optical Data:

Uniaxial (+), w=1.46, e=1.47, bire=0.0100.

Calculated Properties of Tincalconite

Electron Density:

r_electron=1.91 gm/cc
note: r_Tincalconite=1.88 gm/cc.

Fermion Index

Fermion Index = 0.03048
Boson Index = 0.96952

Photoelectric:

PE_Tincalconite= 0.51 barns/electron
U=PE_Tincalconite x r_electron= 0.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tincalconite is Not Radioactive

Tincalconite Classification

Dana Class:

26.4.2.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.4)Dana Type

(26.4.2)Dana Group

26.4.2.1 Tincalconite Na6[B4O5(OH)4]3·8(H2O) R 32 3 2

Strunz Class:

V/H.10-20 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2-

V/H.10 - Diomignite - Borax series

V/H.10-10 Diomignite Li2B4O7 I 4₁cd 4mm

V/H.10-20 Tincalconite Na6[B4O5(OH)4]3·8(H2O) R 32 3 2

V/H.10-30 Borax Na2B4O5(OH)4·8(H2O) A2/a 2/m

Other Tincalconite Information

References:

NAME( MinRec) PHYS. PROP.(AmMin Vol 87, p 350) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Tincalconite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Glendale Community College
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Tincalconite

Na6[B4O5(OH)4]3·8(H2O)
Dana No: 26.4.2.1 Strunz No: V/H.10-20
Locality:

Notes: