Meyerhofferite Mineral Data

Meyerhofferite Mineral Data +

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General Meyerhofferite Information

Chemical Formula:

Ca2B6O6(OH)10·2(H2O)

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

Empirical Formula:

Ca₂B₆O₆(OH)₁₀·2(H₂O)

Environment:

Commonly forms pseudomorphs after inyoite by dehydration.

IMA Status:

Valid Species (Pre-IMA) 1914

Locality:

Mount Blanco mine, Mount Blanco, Black Mountains, Death Valley, Inyo Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for Wilhelm Myerhoffer (1864-1906), German chemist who synthesized the mineral.

Synonym:

ICSD 75922

PDF 12-411

Meyerhofferite Image

Images:

Meyerhofferite

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

Axial Ratios:

a:b:c =0.795:1:0.7802

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

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 6.47(1), 8.31(1), 4.97(0.25),

Forms:

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Forms: [ 0 1 0] [ 0 1 1] [ 1 0 1] [ 1 1 0] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Burns P C , Hawthorne F C , The Canadian Mineralogist , 31 (1993) p.305-312, Hydrogen bonding in meyerhofferite: An X-ray and structure energy study, from Mount Blanco, Death Valley, California, Locality: Mount Blanco, Death Valley, California, USA

Physical Properties of Meyerhofferite

Cleavage:

[010] Perfect, [100] Indistinct, [110] Indistinct

Color:

Colorless, White.

Density:

2.12

Diaphaniety:

Transparent to translucent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Meyerhofferite

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

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

Electron Density:

r_electron=2.17 gm/cc
note: r_{Meyerhofferite}=2.13 gm/cc.

Fermion Index

Fermion Index = 0.02942
Boson Index = 0.97058

Photoelectric:

PE_{Meyerhofferite}= 2.41 barns/electron
U=PE_{Meyerhofferite} x r_electron= 5.23 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Meyerhofferite is Not Radioactive

Meyerhofferite Classification

Dana Class:

26.3.2.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.3)Dana Type

(26.3.2)Dana Group

26.3.2.1 Meyerhofferite Ca2B6O6(OH)10·2(H2O) P1 1

Strunz Class:

V/H.06-40 V - Nitrates, Carbonates and Borates

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

V/H.06 - Kurnakovite - Solongoite series

V/H.06-10 Kurnakovite MgB3O3(OH)5·5(H2O) P1 1

V/H.06-20 Inderite MgB3O3(OH)5·5(H2O) P 2₁/a 2/m

V/H.06-30 Inderborite CaMg[B3O3(OH)5]2·6(H2O) A2/a 2/m

V/H.06-40 Meyerhofferite Ca2B6O6(OH)10·2(H2O) P1 1

V/H.06-50 Inyoite Ca2B6O6(OH)10·8(H2O) P 2₁/a 2/m

V/H.06-60 Solongoite Ca2B3O4(OH)4Cl P 2₁/c 2/m

Other Meyerhofferite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Meyerhofferite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Meyerhofferite

Ca2B6O6(OH)10·2(H2O)
Dana No: 26.3.2.1 Strunz No: V/H.06-40
Locality:

Notes: