Tridymite Mineral Data

Tridymite 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 Tridymite Information

Help on Chemical Formula: Chemical Formula: SiO2
Help on Composition: Composition: Molecular Weight = 60.08 gm
   Silicon  46.74 %  Si  100.00 % SiO2
   Oxygen   53.26 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (SiO2)
Help on Environment: Environment: Cavities in volcanic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1868
Help on Locality: Locality: Occurs world wide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek Tridymos - "triplex."
Help on Name Pronunciation: Name Pronunciation: Tridymite + Pronunciation Say TRIDYMITE
 

Tridymite Image

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

Tridymite

Comments: Clear, pseudohexagonal crystals of tridymite on matrix.
Location: Bellerberg quarry, Laacher See, Rhineland-Palatinate, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Tridymite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5769:1:4.7551
Help on Cell Dimensions: Cell Dimensions: a = 9.932, b = 17.216, c = 81.864, Z = 330; alpha = 90°, beta = 90°, gamma = 90° V = 13,997.87 Den(Calc)= 2.35
Help on Crystal System: Crystal System: Triclinic - PedialH-M Symbol (1) Space Group: F1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.107(1), 4.328(0.9), 3.818(0.5),
Click Here for Large Tridymite 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


Dollase W A , Baur W H , American Mineralogist , 61 (1976) p.971-978, The superstructure of meteoritic low tridymite solved by computer simulation

View Additional jPOWD Structure files for Tridymite
[1] [2] [3] [4]
 

Physical Properties of Tridymite

Help on Cleavage: Cleavage: {0001} Indistinct, {1010} Imperfect
Help on Color: Color: Colorless, White, Yellowish white, Gray.
Help on Density: Density: 2.28 - 2.33, Average = 2.3
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luminescence: Luminescence: Fluorescent, Short UV=dark cherry red.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Tridymite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2035,KPDmeas= 0.2075,KC= 0.208
Ncalc = 1.47 - 1.49
Help on Optical Data: Optical Data: Biaxial (+), a=1.471-1.482, b=1.472-1.483, g=1.474-1.488, bire=0.0030-0.0060, 2V(Calc)=50-72, 2V(Meas)=36-90. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Tridymite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.30 gm/cc
note: Specific Gravity of Tridymite =2.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PETridymite = 1.80 barns/electron
U=PETridymite x rElectron Density= 4.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tridymite is Not Radioactive
 

Tridymite Classification
Help on Dana Class: Dana Class: 75.01.02.01 (75)Tectosilicate Si Tetrahedral Frameworks
  (75.01)SiO2 with [4] coordinated Si
  (75.01.02)Dana Group
 
75.01.02.01 Tridymite SiO2 F1 1
Help on Strunz Class: Strunz Class: 04.DA.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DA -With small cations
 
04.DA.10 Opal SiO2•n(H2O) None
 
04.DA.10 Tridymite SiO2 F1 1
 

Other Tridymite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Larousse des Mineraux,1981)
Help on See Also: See Also: Links to other databases for Tridymite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
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 - Mineral and Gemstone Kingdom
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Tridymite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Tridymite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Diamond Dan Publications

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Tridymite Mineral Data :

Ask about Tridymite 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 Tridymite Specimen Label here :

Tridymite

SiO2
Dana No: 75.01.02.01 Strunz No: 04.DA.10
Locality:

 

Notes: