Malladrite Mineral Data

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



[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts]
See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM]
Mineral News was founded some twenty years ago and has developed a following of
avid mineral collectors seeking timely information about new finds and other items
of interest to the collector community. Articles are solicited from collector and scientific authors.


General Malladrite Information

Help on Chemical Formula: Chemical Formula: Na2SiF6
Help on Composition: Composition: Molecular Weight = 188.06 gm
   Sodium    24.45 %  Na   32.96 % Na2O
   Silicon   14.93 %  Si   31.95 % SiO2
   Fluorine  60.62 %  F    60.62 % F
               -   %   F   -25.52 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2SiF6
Help on Environment: Environment: Sublimate from fumaroles.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1926
Help on Locality: Locality: Vesuvius, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alessandro Malladra (1865-1945), Italian volcanologist, director of the Vesuvius Observatory.
Help on Name Pronunciation: Name Pronunciation: Malladrite + Pronunciation Say MALLADRITE
Help on Synonym: Synonym: ICSD 16598
  PDF 33-1280
 

Malladrite Image

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

Malladrite   Avogadrite

Comments: Botryoidal pinkish-white avogadrite with yellow malladrite.
Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species
Click Here for Larger Malladrite Image in a New Browser Window Images:
Click Here for Larger Malladrite Image

Malladrite   Avogadrite

Comments: Yellow-orange crystalline malladrite with pinkish white avogadrite.
Location: Eruption of 1926, Vesuvius, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Malladrite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.5688
Help on Cell Dimensions: Cell Dimensions: a = 8.866, c = 5.043, Z = 3; V = 343.30 Den(Calc)= 2.73
Help on Crystal System: Crystal System: Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: P 321
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.281(1), 3.325(0.8), 1.795(0.78),
Click Here for Large Malladrite 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


Zalkin A , Forrester J D , Templeton D H , Acta Crystallographica , 17 (1964) p.1408-1412, The crystal structure of sodium fluorosilicate, Locality: synthetic

 

Physical Properties of Malladrite

Help on Color: Color: Rose, Colorless, White.
Help on Density: Density: 2.714 - 2.755, Average = 2.73
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white
 

Optical Properties of Malladrite

Help on Optical Data: Optical Data: Uniaxial (-), e=1.309, w=1.313, bire=0.0040.
 

Calculated Properties of Malladrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.61 gm/cc
note: Specific Gravity of Malladrite =2.73 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0069745004
Boson Index = 0.9930254996
Help on Photoelectric: Photoelectric: PEMalladrite = 1.27 barns/electron
U=PEMalladrite x rElectron Density= 3.32 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Malladrite is Not Radioactive
 

Malladrite Classification
Help on Dana Class: Dana Class: 11.05.02.01 (11)Halide Complexes; Alumino-fluorides
  (11.05)where (A)m B (X)6
  (11.05.02)Malladrite Group
 
11.05.02.01 Malladrite Na2SiF6 P 321 3 2
 
11.05.02.02 Bararite (NH4)2SiF6 R 3m 3 2/m
 
11.05.02.03 Demartinite! K2[SiF6] P 63mc 6mm
Help on Strunz Class: Strunz Class: 03.CH.05 03 - HALIDES
  03.C - Complex Halides
  03.CH -
 
03.CH.05 Malladrite Na2SiF6 P 321 3 2
 

Other Malladrite Information
Help on References: References: NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Malladrite :
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

Search for Malladrite using:

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

Visit our Advertisers for Malladrite :

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 Malladrite Mineral Data :

Ask about Malladrite 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 Malladrite Specimen Label here :

Malladrite

Na2SiF6
Dana No: 11.05.02.01 Strunz No: 03.CH.05
Locality:

 

Notes: