Mineralogy Database

Hillebrandite Mineral Data

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General Hillebrandite Information

Help on Chemical  Formula: Chemical Formula: Ca6Si3O9(OH)6
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca6Si3O9(OH)6
Help on Environment: Environment: Contact zone between limestone and diorite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1908
Help on Locality: Locality: Velardena mining district, Druango, Mexico Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for William Francis Hillebrand (1853-1925), American geochemist and analytical chemist.
Help on Name Pronunciation: Name Pronunciation: Hillebrandite + Pronunciation Say HILLEBRANDITE
Help on Synonym: Synonym: ICSD 80127
  PDF 42-538

Hillebrandite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.223:1:0.7252
Help on Cell Dimensions: Cell Dimensions: a = 3.6389, b = 16.311, c = 11.829, Z = 2; V = 702.10 Den(Calc)= 2.70
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: C mc21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.92(1), 3.33(0.9), 4.76(0.9),

Physical Properties of Hillebrandite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Colorless, Greenish white, White.
Help on Density: Density: 2.7
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Hillebrandite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Hillebrandite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Hillebrandite =2.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0076660752
Boson Index = 0.9923339248
Help on Photoelectric: Photoelectric: PEHillebrandite = 5.70 barns/electron
U=PEHillebrandite x rElectron Density= 15.54 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hillebrandite is Not Radioactive

Hillebrandite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.02)with chains P=3
  (65.02.03)Dana Group Hillebrandite Ca6Si3O9(OH)6 C mc21 mm2
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: 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

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Dana No: Strunz No: 09.DG.40





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