Rengeite Mineral Data

Rengeite Mineral Data

[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store]
See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Rare Minerals, Meteorites, Equipment and Analytical Services
Excalibur Mineral Company, World leaders in the supply of rare species
Serving the scientific and collector communities since 1974

General Rengeite Information

Chemical Formula:

Sr4ZrTi4Si4O22

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

Empirical Formula:

Sr_3.6Ca_0.1REE_0.05Zr_0.8Ti_4.1Si_4.1O₂₂

Environment:

Anhedral grains in jadeite from blue omphacite-jadeite rock attributed to high-P/T metamorphism. The Sr-Zr-dominant analogue of perrierite.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Itoigawa-Ohmi district, Niigata Prefecture, central Japan. Link to MinDat.org Location Data.

Name Origin:

Named for Mt Renge, near the discovery location and the jadeitite-bearing Renge metamorphic belt.

Synonym:

IMA1998-055

Search for Rengeite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Rengeite Crystallography

Axial Ratios:

a:b:c =2.4616:1:2.111

Cell Dimensions:

a = 13.97, b = 5.675, c = 11.98, Z = 2; beta = 114.26° V = 865.90 Den(Calc)= 4.08

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

None

Color:

Dark greenish brown.

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Adamantine

Streak:

pale greenish brown

Optical Properties of Rengeite

Optical Data:

Biaxial (+)

NCalc= 1.99 - from Gladstone-Dale relationship (KC = 0.2419) where Ncalc=Dcalc*KC+1

Calculated Properties of Rengeite

Electron Density:

r_electron=3.82 gm/cc
note: r_Rengeite=4.08 gm/cc.

Fermion Index

Fermion Index = 0.05883
Boson Index = 0.94117

Photoelectric:

PE_Rengeite= 50.65 barns/electron
U=PE_Rengeite x r_electron= 193.39 barns/cc.

Radioactivity:

GRapi = 678.56 (Gamma Ray American Petroleum Institute Units)

**Estimated Radioactivity from Rengeite** - mild
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr 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

Dana Class:

56.2.8.5 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.8)Perierite - Chevkinite group

56.2.8.1 Chevkinite-(Ce) (Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 2/m 2/m

56.2.8.2 Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m

56.2.8.3 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m

56.2.8.4 Orthochevkinite* (Ce,La,Ca,Na,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22 Unk Ortho

56.2.8.5 Rengeite ! Sr4ZrTi4Si4O22 P 2₁/a 2/m

56.2.8.6 Matsubaraite! Sr4TiTi4Si4O22 P 2₁/a 2/m

56.2.8.7 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m

56.2.8.8 IMA2003-017! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m

Strunz Class:

VIII/C.17-15 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.17 - Fresnoite - Belkovite series

VIII/C.17-05 Matsubaraite! Sr4TiTi4Si4O22 P 2₁/a 2/m

VIII/C.17-15 Rengeite Sr4ZrTi4Si4O22 P 2₁/a 2/m

VIII/C.17-25 Polyakovite-(Ce)! (Ce,La,Nd,Pr,Ca)4(Mg,Fe)(Cr,Fe)2(Ti,Nb)2Si4O22 C 2/m 2/m

VIII/C.17-30 Perrierite-(Ce) (Ce,La,Ca)4(Fe,Mg)2(Ti,Fe)3Si4O22 C 21/a 2/m

Other Rengeite Information

References:

NAME( AmMin, Vol 86, p 1113) PHYS. PROP.(AmMin, Vol 86, p 1113) OPTIC PROP.(AmMin, Vol 86, p 1113)

See Also:

Links to other databases for Rengeite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

Search for Rengeite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Rengeite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Rengeite Mineral Data :

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 Español

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

Rengeite

Sr4ZrTi4Si4O22
Dana No: 56.2.8.5 Strunz No: VIII/C.17-15
Locality:

Notes: