Mineralogy Database

Meyerhofferite Mineral Data

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General Meyerhofferite Information

Help on Chemical  Formula: Chemical Formula: Ca2B6O6(OH)10•2(H2O)
Help on Composition: Composition: Molecular Weight = 447.12 gm
   Calcium   17.93 %  Ca   25.08 % CaO
   Boron     14.51 %  B    46.71 % B2O3
   Hydrogen   3.16 %  H    28.20 % H2O
   Oxygen    64.41 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2B6O6(OH)10•2(H2O)
Help on Environment: Environment: Commonly forms pseudomorphs after inyoite by dehydration.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1914
Help on Locality: Locality: Mount Blanco mine, Mount Blanco, Black Mountains, Death Valley, Inyo Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Wilhelm Myerhoffer (1864-1906), German chemist who synthesized the mineral.
Help on Name Pronunciation: Name Pronunciation: Meyerhofferite + Pronunciation Say MEYERHOFFERITE
Help on Synonym: Synonym: ICSD 75922
  PDF 12-411

Meyerhofferite Image

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Comments: Transparent, tabular crystals of meyerhofferite on matrix.
Location: 20-Mule Team Canyon, Death Valley, Inyo County, California, USA. Scale: Crystal size 1.5 cm.
© John Veevaert

Meyerhofferite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.795:1:0.7802
Help on Cell Dimensions: Cell Dimensions: a = 6.617, b = 8.323, c = 6.494, Z = 1; alpha = 90.55°, beta = 102.28°, gamma = 87.2° V = 349.03 Den(Calc)= 2.13
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.47(1), 8.31(1), 4.97(0.25),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

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

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Physical Properties of Meyerhofferite

Help on Cleavage: Cleavage: {010} Perfect, {100} Indistinct, {110} Indistinct
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.12
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white

Optical Properties of Meyerhofferite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2496,KPDmeas= 0.2508,KC= 0.249
Ncalc = 1.53
Help on Optical Data: Optical Data: Biaxial (-), a=1.5, b=1.535, g=1.56, bire=0.0600, 2V(Calc)=78, 2V(Meas)=78. Dispersion relatively weak.

Calculated Properties of Meyerhofferite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.17 gm/cc
note: Specific Gravity of Meyerhofferite =2.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEMeyerhofferite = 2.41 barns/electron
U=PEMeyerhofferite x rElectron Density= 5.23 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Meyerhofferite is Not Radioactive

Meyerhofferite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.03)Dana Type
  (26.03.02)Dana Group Meyerhofferite Ca2B6O6(OH)10•2(H2O) P1 1
Help on  Strunz Class: Strunz Class: 06.CA.30 06 - BORATES
  06.C - Triborates
  06.CA -Neso-triborates
06.CA.30 Meyerhofferite Ca2B6O6(OH)10•2(H2O) P1 1

Other Meyerhofferite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Meyerhofferite :
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

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Dana No: Strunz No: 06.CA.30





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