Medaite Mineral Data + Say MEDAITE


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General Medaite Information
Help on Chemical Formula: Chemical Formula: (Mn,Ca)6(V+++++,As)Si5O18(OH)
Help on Composition: Composition: Molecular Weight = 827.82 gm
   Calcium     0.97 %  Ca    1.35 % CaO
   Manganese  38.49 %  Mn   49.70 % MnO
   Vanadium    4.92 %  V     8.79 % V2O5
   Silicon    16.96 %  Si   36.29 % SiO2
   Arsenic     1.81 %  As    2.78 % As2O5
   Hydrogen    0.12 %  H     1.09 % H2O
   Oxygen     36.72 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+5.8Ca0.2V5+0.8As0.2Si5O18(OH)
Help on Environment: Environment: Formed at low temperatures and low H2O fugacity in veinlets cutting manganese ores.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: From the Molinello manganese mine, near Chiavari, Val Graveari, Val Graveglia, Liuria, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Dr. Francesco Meda (1926-1977), an amateur mineralogist from Turin, Italy.
Help on Synonym: Synonym: ICSD 26908
  PDF 36-443
 

Medaite Image

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Medaite

Comments: Orange crystalline medaite crust.
Location: Molinello Mine, near Chiavari, Liguria, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Medaite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.2318:1:0.2617
Help on Cell Dimensions: Cell Dimensions: a = 6.712, b = 28.948, c = 7.578, Z = 4; beta = 95.4° V = 1,465.86 Den(Calc)= 3.75
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.259(1), 3.159(0.83), 3.097(0.7),
 

Physical Properties of Medaite

Help on Cleavage: Cleavage: [100] Good, [001] Parting
Help on Color: Color: Brownish red.
Help on Density: Density: 3.7
Help on Diaphaniety: Diaphaniety: Transparent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Luster: Luster: Subadamantine
Help on Streak: Streak: yellow white
 

Optical Properties of Medaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2089,KPDmeas= 0.2117,KC= 0.2143
Help on Optical Data: Optical Data: Biaxial (+), a=1.77, b=1.78, g=1.8, bire=0.0300, 2V(Calc)=72, 2V(Meas)=71.
Help on Pleochroism (x): Pleochroism (x): faint orange.
Help on Pleochroism (y): Pleochroism (y): pale orange.
Help on Pleochroism (z): Pleochroism (z): light orange.
 

Calculated Properties of Medaite

Help on Electron Density: Electron Density:

relectron=3.55 gm/cc
note: rMedaite =3.70 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00823
Boson Index = 0.99177
Help on Photoelectric: Photoelectric:

PEMedaite = 12.87 barns/electron
U=PEMedaite x relectron= 45.66 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Medaite is Not Radioactive
 

Medaite Classification
Help on Dana Class: Dana Class: 57.4.1.1 (57)Sorosilicate Insular Si3O10 and Larger Noncyclic Groups
  (57.4)with groups with 6 or more tetrahedra
  (57.4.1)Dana Group
 
57.4.1.1 Medaite (Mn,Ca)6(V,As)Si5O18(OH) P 21/n 2/m
Help on Strunz Class: Strunz Class: VIII/C.34-14 VIII - Silicates
  VIII/C - Sorosilicates, other group-silicates
  VIII/C.34 - Ardennite - Orientite series
 
VIII/C.34-10 Ardennite (Mn,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6 Pnmm 2/m 2/m 2/m
 
VIII/C.34-14 Medaite (Mn,Ca)6(V,As)Si5O18(OH) P 21/n 2/m
 
VIII/C.34-16 Saneroite Na2(Mn,Fe)10Si11VO34(OH)4 P1 1
 
VIII/C.34-20 Orientite Ca2MnMn2Si3O10(OH)4 C mcm 2/m 2/m 2/m
 

Other Medaite Information
Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Medaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Medaite

(Mn,Ca)6(V+++++,As)Si5O18(OH)
Dana No: 57.4.1.1 Strunz No: VIII/C.34-14
Locality:

 

Notes:

 
 
   
 
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