Mineralogy Database

Rengeite Mineral Data

Search Webmineral :

General Rengeite Information

Help on Chemical  Formula: Chemical Formula: Sr4ZrTi4Si4O22
Help on Composition: Composition: Molecular Weight = 1,063.06 gm
   Strontium        29.67 %  Sr   35.09 % SrO
   Calcium           0.38 %  Ca    0.53 % CaO
   La,Ce,Pr,Nd,Sm,   0.68 %  RE    0.79 % REE2O3
   Zirconium         6.86 %  Zr    9.27 % ZrO2
   Titanium         18.47 %  Ti   30.81 % TiO2
   Silicon          10.83 %  Si   23.17 % SiO2
   Oxygen           33.11 %  O
                   ______        ______ 
                   100.00 %       99.66 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Sr3.6Ca0.1REE0.05Zr0.8Ti4.1Si4.1O22
Help on Environment: Environment: Anhedral grains in jadeite from blue omphacite-jadeite rock attributed to high-P/T metamorphism. The Sr-Zr-dominant analogue of perrierite.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Itoigawa-Ohmi district, Niigata Prefecture, central Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Mt Renge, near the discovery location and the jadeitite-bearing Renge metamorphic belt.
Help on Synonym: Synonym: IMA1998-055

Rengeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.4616:1:2.111
Help on Cell Dimensions: Cell Dimensions: a = 13.97, b = 5.675, c = 11.98, Z = 2; beta = 114.26° V = 865.90 Den(Calc)= 4.08
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.06(1)(313), 3(0.9)(204,311), 2.74(0.75),2.86(0.75)(020), 3.11(0.75)(400), 3.13(0.75)(403), 1.967(0.5), 2.3(0.5), 2.51(0.5)(222

Physical Properties of Rengeite

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark greenish brown.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luster: Luster: Adamantine
Help on Streak: Streak: pale greenish brown

Optical Properties of Rengeite

Help on Optical Data: Optical Data: Biaxial (+)
  NCalc= 1.99 - from Gladstone-Dale relationship (KC = 0.2419) where Ncalc=Dcalc*KC+1

Calculated Properties of Rengeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.82 gm/cc
note: Specific Gravity of Rengeite =4.08 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PERengeite = 50.65 barns/electron
U=PERengeite x relectron= 193.39 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 678.56 (Gamma Ray American Petroleum Institute Units)
Concentration of Rengeite per GRapi unit =1,473.72 (PPM)

Estimated Radioactivity from Rengeite - mild
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.76 cm 15,226 4.12E-07 678.56 0.22
100 gm / 3.60 cm 1,523 4.12E-08 67.86 0.02
10 gm / 1.67 cm 152 4.12E-09 6.79 0.00
1 gm / 7.76 mm 15 4.12E-10 0.68 0.00
0.1 gm / 3.60 mm 2 4.12E-11 0.07 0.00
0.01 gm / 1.67 mm 0 4.12E-12 0.01 0.00
0.001 gm / 0.78 mm 0 4.12E-13 0.00 0.00

Weight of pure Rengeite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.08 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.03 % Th) From Sum REE Elements ( 0.68 % REE)

Rengeite Classification

Help on  Dana Class: Dana Class: (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.08)Perierite - Chevkinite group Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m Orthochevkinite* (Ce,La,Ca,Na,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 Unk Ortho Rengeite! Sr4ZrTi4Si4O22 P 21/a 2/m Matsubaraite! Sr4TiTi4Si4O22 P 21/a 2/m Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m Maoniupingite-(Ce)! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m Dingdaohengite-(Ce)! (Ce,La)4Fe(Ti,Fe,Mg,Fe)2Ti2Si4O22 P 21/a (pseudo-C 2/m) 2/m
Help on  Strunz Class: Strunz Class: 09.BE.70 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
09.BE.70 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m
09.BE.70 Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4•3(H2O)(?) Unk. Hex
09.BE.70 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m
09.BE.70 Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m
09.BE.70 Rengeite! Sr4ZrTi4Si4O22 P 21/a 2/m
09.BE.70 Maoniupingite-(Ce)! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m
09.BE.70 Matsubaraite! Sr4TiTi4Si4O22 P 21/a 2/m
09.BE.70 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m
09.BE.70 Dingdaohengite-(Ce)! (Ce,La)4Fe(Ti,Fe,Mg,Fe)2Ti2Si4O22 P 21/a (pseudo-C 2/m) 2/m

Other Rengeite Information

Help on References: References: NAME( AmMin, Vol 86, p 1113) PHYS. PROP.(AmMin, Vol 86, p 1113) OPTIC PROP.(AmMin, Vol 86, p 1113)
Help on See Also: See Also: Links to other databases for Rengeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Rengeite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Rengeite :

Ask about Rengeite 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 Rengeite Specimen Label here :


Dana No: Strunz No: 09.BE.70





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.