Datolite Mineral Data

Datolite Mineral Data +

General Datolite Information

Chemical Formula:

CaBSiO4(OH)

Composition:

Molecular Weight = 159.98 gm

Calcium 25.05 % Ca 35.05 % CaO

Silicon 17.56 % Si 37.56 % SiO₂

Boron 6.76 % B 21.76 % B₂O₃

Hydrogen 0.63 % H 5.63 % H₂O

Oxygen 50.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaB(SiO₄)(OH)

Environment:

Secondary mineral in basic igneous rocks.

IMA Status:

Valid Species (Pre-IMA) 1806

Locality:

Diabases of the Connecticut River valley, USA. Link to MinDat.org Location Data.

Name Origin:

From the Greek, dateisthai, meaning "to divide," because granular aggregates crumble readily.

Synonym:

ICSD 22026

PDF 36-429

Datolite Image

Images:

Datolite

Comments: Cluster of doubly-terminated datolite crystals to 3.3 cm across with a scattering of brown inclusions.
Location: Boron Pit, Dal'Negorsk, Russia. Scale: 5x3.9x3.7 cm.
© Fabre Minerals

Datolite Crystallography

Axial Ratios:

a:b:c =1.2643:1:0.6321

Cell Dimensions:

a = 9.66, b = 7.64, c = 4.83, Z = 4; beta = 90.15° V = 356.46 Den(Calc)= 2.98

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): 3.114(1), 2.855(0.65), 2.189(0.6),

Forms:

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Forms: [ 1 1 0] [ 0 1 1] [ 1 1 2] [ 1 0 0] [ 1 1 1]

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Crystal Structure:

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Foit F F , Phillips M W , Gibbs G V , American Mineralogist , 58 (1973) p.909-914, A refinement of the crystal structure of datolite, CaBSiO4(OH)

View Additional jPOWD Structure files for Datolite
[1]

Physical Properties of Datolite

Cleavage:

None

Color:

Brown, Colorless, Yellow, White, Light green.

Density:

2.8 - 3, Average = 2.9

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Porcelainous - Fine-grained, translucent massive material like broken china

Habit:

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

Hardness:

5.5 - Knife Blade

Luminescence:

None.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Datolite

Gladstone-Dale:

CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2181,KPDmeas= 0.2241,KC= 0.2177

Optical Data:

Biaxial (-), a=1.626, b=1.653-1.654, g=1.67, bire=0.0440, 2V(Calc)=72-74, 2V(Meas)=74. Dispersion none.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Datolite

Electron Density:

r_electron=2.98 gm/cc
note: r_Datolite=2.98 gm/cc.

Fermion Index

Fermion Index = 0.02222
Boson Index = 0.97778

Photoelectric:

PE_Datolite= 3.83 barns/electron
U=PE_Datolite x r_electron= 11.41 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Datolite is Not Radioactive

Datolite Classification

Dana Class:

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

(54.2)with B in [4] coordination

(54.2.1a)Datolite group (Datolite series)

54.2.1a.1 Datolite CaBSiO4(OH) P 2₁/c 2/m

54.2.1a.2 Hingganite-(Ce) Ce2Be2(SiO4)2(OH)2 P 2₁/a 2/m

54.2.1a.3 Hingganite-(Y) Y2([])Be2Si2O8(OH)2 P 2₁/a 2/m

54.2.1a.4 Hingganite-(Yb) (Yb,Y)2([])Be2Si2O8(OH)2 P 2₁/a 2/m

54.2.1a.5 Calcybeborosilite-(Y)! (REE,Ca)2[](B,Be)2(SiO4)2(OH,O)2 P 2₁/a 2/m

Strunz Class:

VIII/B.29-10 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 Datolite Information

References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)

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Datolite

CaBSiO4(OH)
Dana No: 54.2.1a.1 Strunz No: VIII/B.29-10
Locality:

Notes: