Spadaite Mineral Data

Spadaite Mineral Data

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General Spadaite Information

Chemical Formula:

MgSiO2(OH)2·(H2O) (?)

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

Empirical Formula:

Mg(SiO₂)(OH)₂·(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1843

Locality:

Capo di Bove, near Rome, Italy. Link to MinDat.org Location Data.

Spadaite Image

Images:

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

Crystal System:

Amorphous- No Crystals

Physical Properties of Spadaite

Cleavage:

None

Color:

Colorless, Cream, Pinkish.

Density:

2.2

Diaphaniety:

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

Optical Properties of Spadaite

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2411,KC= 0.2405

Optical Data:

Biaxial (+), a=1.521, b=1.525, g=1.545, bire=0.0240

Calculated Properties of Spadaite

Electron Density:

r_electron=2.26 gm/cc
note: r_Spadaite=2.20 gm/cc.

Fermion Index

Fermion Index = 0.02771
Boson Index = 0.97229

Photoelectric:

PE_Spadaite= 1.25 barns/electron
U=PE_Spadaite x r_electron= 2.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Spadaite is Not Radioactive

Spadaite Classification

Dana Class:

78.7.14.1 (78)Unclassified silicates

(78.7)wholly unclassified silicates

(78.7.14)Dana Group

78.7.14.1 Spadaite MgSiO2(OH)2·(H2O)(?) None

Strunz Class:

VIII/H.20-30 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.20 - Hectorite - Zincsilite series

VIII/H.20-10 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m

VIII/H.20-20 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

VIII/H.20-27 Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2·4(H2O) C? Mono

VIII/H.20-30 Spadaite MgSiO2(OH)2·(H2O)(?) None

VIII/H.20-40 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2·n(H2O) Unk (ORTH ?) Mono

VIII/H.20-50 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

VIII/H.20-60 Zincsilite Zn3Si4O10(OH)2·4(H2O)(?) C 2/m ? 2/m

Other Spadaite Information

References:

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

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Print or Cut-and-Paste your Spadaite Specimen Label here :

Spadaite

MgSiO2(OH)2·(H2O) (?)
Dana No: 78.7.14.1 Strunz No: VIII/H.20-30
Locality:

Notes: