Hillebrandite Mineral Data

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.

Name Origin:

Named for William Francis Hillebrand (1853-1925), American geochemist and analytical chemist.

Name Pronunciation:

Hillebrandite + Pronunciation

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 - Pyramidal H-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),

Physical Properties of Hillebrandite

Cleavage:

{???} Good

Color:

Colorless, Greenish white, White.

Density:

2.7

Diaphaneity:

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
Ncalc = 1.6

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:

Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Hillebrandite =2.70 gm/cc.

Fermion Index:

Fermion Index = 0.0076660752
Boson Index = 0.9923339248

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hillebrandite is Not Radioactive

Hillebrandite Classification

Dana Class:

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

(65.02)with chains P=3

(65.02.03)Dana Group

65.02.03.01 Hillebrandite Ca6Si3O9(OH)6 C mc2₁ mm2

Strunz Class:

09.DG.40 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DG -Inosilicates with 3-periodic single and multiple chains

09.DG.40 Hillebrandite Ca6Si3O9(OH)6 C mc2₁ mm2

Other Hillebrandite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Hillebrandite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Hillebrandite

Ca6Si3O9(OH)6
Dana No: 65.02.03.01 Strunz No: 09.DG.40
Locality:

Notes:

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