Meyerhofferite Mineral Data

Meyerhofferite Mineral Data +

[Fine Minerals] [What's New] [Mineral Galleries] [My Collection] [Mineral Auctions]
Dan Weinrich Fine Minerals
Full-time professional mineral dealer with over 31 years experience in mineral collecting
And 15 years selling mineral specimens on the internet and at major mineral shows

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:

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

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Meyerhofferite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Meyerhofferite :

AA Mineral Specimens

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

MineralsWeb Fine Minerals

The GeoZone

Wrights Rock Shop

Translate Meyerhofferite Mineral Data :

Ask about Meyerhofferite 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 Meyerhofferite Specimen Label here :

Meyerhofferite

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

Notes: