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Spadaite Mineral Data

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General Spadaite Information

Help on Chemical  Formula: Chemical Formula: MgSiO2(OH)2•(H2O) (?)
Help on Composition: Composition: Molecular Weight = 136.42 gm
   Magnesium  17.82 %  Mg   29.54 % MgO
   Silicon    20.59 %  Si   44.04 % SiO2
   Hydrogen    2.96 %  H    26.41 % H2O
   Oxygen     58.64 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg(SiO2)(OH)2•(H2O)
Help on Environment: Environment: Found replacing tactite minerals.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1843
Help on Locality: Locality: Capo di Bove, near Rome, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Lavino Spada (De Medici) (1801-1863), Italian politicioan and amateur mineralogist.
 

Spadaite Image

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  Spadaite

Comments: Tan mottled silky fibrous spadaite, slightly flexible coatings.
Location: Palos Verdes Hills, Los Angeles County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Spadaite Crystallography

Help on Crystal System: Crystal System: Orthorhombic
 

Physical Properties of Spadaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Cream, Pinkish.
Help on Density: Density: 2.2
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Habit: Habit: Amorphous - No crystalline form or imitative shape.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Dull
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Spadaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2414,KC= 0.2405
Ncalc = 1.53
Help on Optical Data: Optical Data: Biaxial (+), a=1.521, b=1.525-1.53, g=1.545, bire=0.0240
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.
 

Calculated Properties of Spadaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.26 gm/cc
note: Specific Gravity of Spadaite =2.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESpadaite = 1.25 barns/electron
U=PESpadaite x rElectron Density= 2.83 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Spadaite is Not Radioactive
 

Spadaite Classification

Help on  Dana Class: Dana Class: 78.07.14.01 (78)Unclassified silicates
  (78.07)wholly unclassified silicates
  (78.07.14)Dana Group
 
78.07.14.01 Spadaite MgSiO2(OH)2•(H2O)(?) Ortho
 
78.07.14.02 Chesnokovite! Na2[SiO2(OH)2]•8H2O I bca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.EC.45 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
 
09.EC.45 Griffithite* 4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) Mono
 
09.EC.45 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m
 
09.EC.45 Swinefordite (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2•2(H2O) C 2/m (MON or ORTH) 2/m
 
09.EC.45 Zincsilite Zn3Si4O10(OH)2•4(H2O)(?) C 2/m ? 2/m
 
09.EC.45 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
 
09.EC.45 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
 
09.EC.45 Spadaite MgSiO2(OH)2•(H2O)(?) Ortho
 
09.EC.45 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O) Unk. Mono
 
09.EC.45 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2•n(H2O) Unk (ORTH ?) Mono
 
09.EC.45 Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C? Mono
 

Other Spadaite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Spadaite :
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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Spadaite

MgSiO2(OH)2•(H2O) (?)
Dana No: 78.07.14.01 Strunz No: 09.EC.45
Locality:

 

Notes:

 

 
   
 


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