Tincalconite Mineral Data + Say TINCALCONITE

General Tincalconite Information
Help on Chemical Formula: Chemical Formula: Na6[B4O5(OH)4]3·8(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na6B12O15(OH)12·8(H2O)
Help on Environment: Environment: Dehydration of borax or other Na borates.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1878
Help on Locality: Locality: Searles Lake, San Bernardino Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for tincal (borax) and konos "powder" in allusion to the minerals composition and appearance.
Help on Synonym: Synonym: ICSD 66529
  PDF 7-277
 

Tincalconite Image

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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
Help on Axial Ratios: Axial Ratios: a:c = 1:1.90364
Help on Cell Dimensions: Cell Dimensions: a = 11.1402, c = 21.207, Z = 3; V = 2,279.27 Den(Calc)= 1.87
Help on Crystal System: Crystal System: Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: R 32
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.92(1), 4.38(0.9), 3.44(0.55),
Click Here for Large Tincalconite Structure Window 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

Help on Color: Color: White.
Help on Density: Density: 1.88
Help on Diaphaniety: Diaphaniety: Opaque
Help on Habit: Habit: Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Tincalconite

Help on Dichroism (w): Dichroism (w): none.
Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.46, e=1.47, bire=0.0100.
 

Calculated Properties of Tincalconite

Help on Electron Density: Electron Density:

relectron=1.91 gm/cc
note: rTincalconite =1.88 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.03048
Boson Index = 0.96952
Help on Photoelectric: Photoelectric:

PETincalconite = 0.51 barns/electron
U=PETincalconite x relectron= 0.98 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tincalconite is Not Radioactive
 

Tincalconite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( MinRec) PHYS. PROP.(AmMin Vol 87, p 350) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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 - Glendale Community College 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST 15 -École des Mines de Paris

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Tincalconite

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

 

Notes:

 
 
   
 
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