Medaite Mineral Data

Medaite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About


Lapis Mineral Magazine
[Home] [What's New] [Extra Lapis] [Subscription] [Book Shop]
Lapis Mineral Magazine
Lapis is a german-language Mineral Magazine for Lovers and Collectors of Minerals and Gems
Subscription costs only € 47 per year, plus shipping costs


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 Name Pronunciation: Name Pronunciation: Medaite Say MEDAITE
Help on Synonym: Synonym: ICSD 26908
  PDF 36-443
 

Medaite Image

Click Here for Larger Medaite Image in a New Browser Window Images:
Click Here for Larger Medaite Image

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),
Click Here for Large Medaite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


Gramaccioli C M , Liborio G , Pilati T , Acta Crystallographica, Section B , 37 (1981) p.1972-1978, Structure of medaite, Mn6[VSi5O18(OH)]: The presence of a new kind of, heteropolysilicate anion, Locality: Molinello, Chavari, Liguria, Italy, Note: anisoB s from ICSD

 

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 Diaphaneity: Diaphaneity: 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
Ncalc = 1.79 - 1.8
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: Bulk Density (Electron Density)=3.55 gm/cc
note: Specific Gravity of Medaite =3.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0082345821
Boson Index = 0.9917654179
Help on Photoelectric: Photoelectric: PEMedaite = 12.87 barns/electron
U=PEMedaite x rElectron Density= 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: 57.04.01.01 (57)Sorosilicate Insular Si3O10 and Larger Noncyclic Groups
  (57.04)with groups with 6 or more tetrahedra
  (57.04.01)Dana Group
 
57.04.01.01 Medaite (Mn,Ca)6(V,As)Si5O18(OH) P 21/n 2/m
Help on Strunz Class: Strunz Class: 09.BJ.30 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BJ -Sorosilicates with Si3O10, Si4O11, etc
 
09.BJ.30 Medaite (Mn,Ca)6(V,As)Si5O18(OH) P 21/n 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 - 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
15 - WWW-MINCRYST

Search for Medaite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [bing] [GeoScienceWorld] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Medaite :

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

John Betts Fine Minerals

Lapis Mineral Journal

Mineral News

UV Tools

Wrights Rock Shop

Translate Medaite Mineral Data :

Ask about Medaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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

Medaite

(Mn,Ca)6(V+++++,As)Si5O18(OH)
Dana No: 57.04.01.01 Strunz No: 09.BJ.30
Locality:

 

Notes: