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Falcondoite Mineral Data

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General Falcondoite Information

Help on Chemical  Formula: Chemical Formula: (Ni,Mg)4Si6O15(OH)2•6(H2O)
Help on Composition: Composition: Molecular Weight = 750.99 gm
   Magnesium   3.24 %  Mg    5.37 % MgO
   Silicon    22.44 %  Si   48.00 % SiO2
   Nickel     23.45 %  Ni   29.84 % NiO
   Hydrogen    1.88 %  H    16.79 % H2O
   Oxygen     49.00 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ni3MgSi6O15(OH)2•6(H2O)
Help on Environment: Environment: Laterite deposits. Nickel analog of sepiolite.
Help on IMA Status: IMA Status: Approved IMA 1976
Help on Locality: Locality: Loma Peruera laterite deposit at Bonao, Dominican Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the contraction of FALCONbridge DOminica C. Por A., the mining company at the type locality.
Help on Name Pronunciation: Name Pronunciation: Falcondoite + Pronunciation Say FALCONDOITE
Help on Synonym: Synonym: Garnierite

Falcondoite Image

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Comments: Solid mass of lime green falcondoite.
Location: Riddle, Douglas County, Oregon. USA. Scale: 4 cm.
© John Veevaert

Falcondoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5018:1:0.1947
Help on Cell Dimensions: Cell Dimensions: a = 13.5, b = 26.9, c = 5.24, Z = 4; V = 1,902.91 Den(Calc)= 2.62
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pncn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.2(1), 2.44(0.3), 3.33(0.3),2.62(0.3), 2.53(0.3), 3.19(0.2), 2.26(0.2), 2.39(0.2),

Physical Properties of Falcondoite

Help on Cleavage: Cleavage: {???} Distinct
Help on Color: Color: Green, Yellowish green.
Help on Density: Density: 2.54
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Friable - The crumbly disintegration of earthy materials or highly fractured minerals.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Resinous
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Falcondoite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.047 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2099,KPDmeas= 0.2165,KC= 0.2202
Ncalc = 1.56 - 1.58
Help on Optical Data: Optical Data: Biaxial (?), b=1.55

Calculated Properties of Falcondoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.56 gm/cc
note: Specific Gravity of Falcondoite =2.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFalcondoite = 10.03 barns/electron
U=PEFalcondoite x rElectron Density= 25.64 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Falcondoite is Not Radioactive

Falcondoite Classification

Help on  Dana Class: Dana Class: 74.03.01b.02 (74)Phyllosilicate Modulated Layers
  (74.03)with joined strips
  (74.03.01b)Palygorskite-sepiolite group (Sepiolite subgroup)
74.03.01b.01 Sepiolite Mg4Si6O15(OH)2•6(H2O) Pnan 2/m 2/m 2/m
74.03.01b.02 Falcondoite (Ni,Mg)4Si6O15(OH)2•6(H2O) Pncn 2/m 2/m 2/m
74.03.01b.03 Loughlinite Na2Mg3Si6O16•8(H2O) Unk Ortho
Help on  Strunz Class: Strunz Class: 09.EE.25 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.25 Falcondoite (Ni,Mg)4Si6O15(OH)2•6(H2O) Pncn 2/m 2/m 2/m
09.EE.25 Loughlinite Na2Mg3Si6O16•8(H2O) Unk Ortho
09.EE.25 Kalifersite! (K,Na)5Fe7Si20O50(OH)6•12(H2O) P1 1
09.EE.25 Sepiolite Mg4Si6O15(OH)2•6(H2O) Pnan 2/m 2/m 2/m

Other Falcondoite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Falcondoite :
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: 74.03.01b.02 Strunz No: 09.EE.25





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