Bakerite Mineral Data

Bakerite Mineral Data +

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General Bakerite Information

Chemical Formula:

Ca4B4(BO4)(SiO4)3(OH)3·(H2O)

Composition:

Molecular Weight = 623.65 gm

Calcium 25.71 % Ca 35.97 % CaO

Silicon 13.51 % Si 28.90 % SiO₂

Boron 8.67 % B 27.91 % B₂O₃

Hydrogen 0.81 % H 7.22 % H₂O

Oxygen 51.31 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₄B₄(BO₄)(SiO₄)₃(OH)₃·(H₂O)

Environment:

Occurs as irregular veins in altered volcanic rock (Baker Canyon, Death Valley, California, USA).

IMA Status:

Valid Species (Pre-IMA) 1903

Locality:

Corkscrew mine, Corkscrew Canyon, Death Valley, Inyo Co. California. Link to MinDat.org Location Data.

Name Origin:

For Richard C. Baker, of Nutfield, Surrey, England, Mining Director of the Pacific Coast Borax Co., who discovered the mineral.

Bakerite Image

Images:

Bakerite

Comments: Porcelain-like, massive bakerite.
Location: Twenty Mule Canyon, Death Valley, Inyo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bakerite Crystallography

Axial Ratios:

a:b:c =0.6358:1:1.2664

Cell Dimensions:

a = 4.85, b = 7.627, c = 9.659, Z = 1; beta = 90.255° V = 357.29 Den(Calc)= 2.90

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 3.11(1), 2.236(0.6), 2.85(0.6),

Crystal Structure:

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Help on Above

Perchiazzi N , Gualtieri A F , Merlino S , Kampf A R , American Mineralogist , 89 (2004) p.767-776, The atomic structure of bakerite and its relationship to datolite, Sample: Refinement of the conventional X-ray data for sample #92735

View Additional jPOWD Structure files for Bakerite
[1] [2] [3] [4]

Physical Properties of Bakerite

Color:

Colorless, White.

Density:

2.7 - 2.9, Average = 2.8

Diaphaniety:

Transparent

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Bakerite

Gladstone-Dale:

CI meas= -0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2199,KPDmeas= 0.2277,KC= 0.2202

Optical Data:

Biaxial (-), a=1.624, b=1.635, g=1.654, bire=0.0300

Calculated Properties of Bakerite

Electron Density:

r_electron=2.90 gm/cc
note: r_Bakerite=2.90 gm/cc.

Fermion Index

Fermion Index = 0.02415
Boson Index = 0.97585

Photoelectric:

PE_Bakerite= 3.78 barns/electron
U=PE_Bakerite x r_electron= 10.97 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bakerite is Not Radioactive

Bakerite Classification

Dana Class:

54.2.1b.1 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.2)with B in [4] coordination

(54.2.1b)Datolite group (Homilite series)

54.2.1b.1 Bakerite Ca4B4(BO4)(SiO4)3(OH)3·(H2O) P 2₁/c 2/m

54.2.1b.2 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 2₁/c 2/m

54.2.1b.3 Gadolinite-(Y) Y2FeBe2Si2O10 P 2₁/a 2/m

54.2.1b.4 Calciogadolinite* CaREE(Fe)Be2Si2O10 P 2₁/a 2/m

54.2.1b.5 Homilite Ca2(Fe,Mg)B2Si2O10 P 2₁/a 2/m

54.2.1b.6 Minasgeraisite-(Y) CaY2Be2Si2O10 P 2₁/a 2/m

Strunz Class:

VIII/B.29-20 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron

VIII/B.29 - Datolite/Gadolinite group

VIII/B.29-10 Datolite CaBSiO4(OH) P 2₁/c 2/m

VIII/B.29-20 Bakerite Ca4B4(BO4)(SiO4)3(OH)3·(H2O) P 2₁/c 2/m

VIII/B.29-30 Homilite Ca2(Fe,Mg)B2Si2O10 P 2₁/a 2/m

VIII/B.29-35 Vistepite Mn4SnB2(SiO4)4(OH)2 P1 1

VIII/B.29-40 Minasgeraisite-(Y) CaY2Be2Si2O10 P 2₁/a 2/m

VIII/B.29-50 Gadolinite-(Y) Y2FeBe2Si2O10 P 2₁/a 2/m

VIII/B.29-60 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 2₁/c 2/m

VIII/B.29-70 Hingganite-(Y) Y2([])Be2Si2O8(OH)2 P 2₁/a 2/m

VIII/B.29-80 Hingganite-(Ce) Ce2Be2(SiO4)2(OH)2 P 2₁/a 2/m

VIII/B.29-90 Hingganite-(Yb) (Yb,Y)2([])Be2Si2O8(OH)2 P 2₁/a 2/m

VIII/B.29-100 Calcybeborosilite-(Y)! (REE,Ca)2[](B,Be)2(SiO4)2(OH,O)2 P 2₁/a 2/m

Other Bakerite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin, v 89, p 767) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Bakerite

Ca4B4(BO4)(SiO4)3(OH)3·(H2O)
Dana No: 54.2.1b.1 Strunz No: VIII/B.29-20
Locality:

Notes: