Hillebrandite Mineral Data

Hillebrandite Mineral Data +

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General Hillebrandite Information

Chemical Formula:

Ca6Si3O9(OH)6

Composition:

Molecular Weight = 570.76 gm

Calcium 42.13 % Ca 58.95 % CaO

Silicon 14.76 % Si 31.58 % SiO₂

Hydrogen 1.06 % H 9.47 % H₂O

Oxygen 42.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₆Si₃O₉(OH)₆

Environment:

Contact zone between limestone and diorite.

IMA Status:

Valid Species (Pre-IMA) 1908

Locality:

Velardena mining district, Druango, Mexico Link to MinDat.org Location Data.

Synonym:

ICSD 80127

PDF 42-538

Hillebrandite Image

Images:

Hillebrandite

Comments: Opaque white fibrous hillebrandite on marble.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hillebrandite Crystallography

Axial Ratios:

a:b:c =0.223:1:0.7252

Cell Dimensions:

a = 3.6389, b = 16.311, c = 11.829, Z = 2; V = 702.10 Den(Calc)= 2.70

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: C mc2₁

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

By Intensity(I/I_o): 2.92(1), 3.33(0.9), 4.76(0.9),

Crystal Structure:

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Dai Y S , Post J E , American Mineralogist , 80 (1995) p.841-844, Crystal structure of hillebrandite: A natural analogue of calcium silicate, hydrate (CSH) phases in Portland cement

Physical Properties of Hillebrandite

Cleavage:

[???] Good

Color:

Colorless, Greenish white, White.

Density:

2.7

Diaphaniety:

Transparent to translucent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

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

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Hillebrandite

Gladstone-Dale:

CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2256,KPDmeas= 0.2256,KC= 0.2217

Optical Data:

Biaxial (-), a=1.605, b=1.61, g=1.612, bire=0.0070, 2V(Calc)=64, 2V(Meas)=60. Dispersion strong, r < v.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Hillebrandite

Electron Density:

r_electron=2.72 gm/cc
note: r_{Hillebrandite}=2.70 gm/cc.

Fermion Index

Fermion Index = 0.00766
Boson Index = 0.99234

Photoelectric:

PE_{Hillebrandite}= 5.70 barns/electron
U=PE_{Hillebrandite} x r_electron= 15.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hillebrandite is Not Radioactive

Hillebrandite Classification

Dana Class:

65.2.3.1 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.2)with chains P=3

(65.2.3)Dana Group

65.2.3.1 Hillebrandite Ca6Si3O9(OH)6 C mc2₁ mm2

Strunz Class:

VIII/F.18-100 VIII - Silicates

VIII/F - Inosilicates (chain and band) Triplet chains [Si3O9]6-

VIII/F.18 - Wollastonite-2M - Foshagite series

VIII/F.18-10 Wollastonite-1A CaSiO3 P1 1

VIII/F.18-10* Wollastonite-2M* CaSiO3 P 2₁ 2

VIII/F.18-10** Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

VIII/F.18-30 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

VIII/F.18-40 Bustamite (Mn,Ca)3Si3O9 P1 1

VIII/F.18-50 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

VIII/F.18-60 Pectolite NaCa2Si3O8(OH) P1 1

VIII/F.18-70 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

VIII/F.18-80 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

VIII/F.18-90 Foshagite Ca4Si3O9(OH)2 P 2₁/m 2/m

VIII/F.18-100 Hillebrandite Ca6Si3O9(OH)6 C mc2₁ mm2

Other Hillebrandite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Hillebrandite

Ca6Si3O9(OH)6
Dana No: 65.2.3.1 Strunz No: VIII/F.18-100
Locality:

Notes: