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Spadaite Mineral Data
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General Spadaite Information
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 Chemical Formula: |
MgSiO2(OH)2•(H2O) (?) |
| Composition: |
Molecular Weight = 136.42 gm |
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Magnesium 17.82 % Mg 29.54 % MgO |
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Silicon 20.59 % Si 44.04 % SiO2 |
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Hydrogen 2.96 % H 26.41 % H2O |
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Oxygen 58.64 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Mg(SiO2)(OH)2•(H2O) |
| Environment: |
Found replacing tactite minerals. |
| IMA Status: |
Valid Species (Pre-IMA) 1843 |
| Locality: |
Capo di Bove, near Rome, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Lavino Spada (De Medici) (1801-1863), Italian politicioan and amateur mineralogist. |
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Spadaite Image |
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Images:
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Spadaite Crystallography
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| Crystal System: |
Orthorhombic |
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Physical Properties of Spadaite
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| Cleavage: |
None |
| Color: |
Colorless, Cream, Pinkish. |
| Density: |
2.2 |
| Diaphaneity: |
Translucent to subtranslucent |
| Habit: |
Amorphous - No crystalline form or imitative shape. |
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
| Hardness: |
2.5 - Finger Nail |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Vitreous - Dull |
| Magnetism: |
Nonmagnetic |
| Streak: |
white |
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Optical Properties of Spadaite
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| Gladstone-Dale: |
CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2414,KC= 0.2405
Ncalc = 1.53 |
| Optical Data: |
Biaxial (+), a=1.521, b=1.525-1.53, g=1.545, bire=0.0240 |
| Pleochroism (x): |
none. |
| Pleochroism (y): |
none. |
| Pleochroism (z): |
none. |
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Calculated Properties of Spadaite
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| Electron Density: |
Bulk Density (Electron Density)=2.26 gm/cc
note: Specific Gravity of Spadaite =2.20 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PESpadaite = 1.25 barns/electron
U=PESpadaite x rElectron Density= 2.83 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Spadaite is Not Radioactive |
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Spadaite Classification
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| Dana Class: |
78.07.14.01 (78)Unclassified silicates |
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(78.07)wholly unclassified silicates |
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(78.07.14)Dana Group |
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78.07.14.01 Spadaite MgSiO2(OH)2•(H2O)(?) Ortho |
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78.07.14.02 Chesnokovite! Na2[SiO2(OH)2]•8H2O I bca 2/m 2/m 2/m |
| Strunz Class: |
09.EC.45 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets |
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09.EC.45 Griffithite* 4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) Mono |
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09.EC.45 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m |
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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 |
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09.EC.45 Zincsilite Zn3Si4O10(OH)2•4(H2O)(?) C 2/m ? 2/m |
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09.EC.45 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m |
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09.EC.45 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m |
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09.EC.45 Spadaite MgSiO2(OH)2•(H2O)(?) Ortho |
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09.EC.45 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O) Unk. Mono |
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09.EC.45 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2•n(H2O) Unk (ORTH ?) Mono |
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09.EC.45 Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C? Mono |
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Other Spadaite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| 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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