Rengeite Mineral Data

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

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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

Crystal Structure:

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Miyawaki R , Matsubara S , Miyajima H , Journal of Mineralogical and Petrological Sciences , 97 (2002) p.7-12, The crystal structure of rengeite, Sr4ZrTi4(Si2O7)2O8, Locality: Itoigawa, Niigata Prefecture, Japan

Physical Properties of Rengeite

Cleavage:

None

Color:

Dark greenish brown.

Diaphaneity:

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:

Bulk Density (Electron Density)=3.82 gm/cc
note: Specific Gravity of Rengeite =4.08 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

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)
Concentration of Rengeite per GRapi unit =1,473.72 (PPM)

**Estimated Radioactivity from Rengeite** - mild
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (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:

56.02.08.05 (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

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

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

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

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

56.02.08.05 Rengeite! Sr4ZrTi4Si4O22 P 2₁/a 2/m

56.02.08.06 Matsubaraite! Sr4TiTi4Si4O22 P 2₁/a 2/m

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

56.02.08.08 Maoniupingite-(Ce)! (REE,Ca)4(Fe,Ti,Fe,[])(Ti,Fe,Fe,Nb)4Si4O22 C 2/m 2/m

56.02.08.09 Dingdaohengite-(Ce)! (Ce,La)4Fe(Ti,Fe,Mg,Fe)2Ti2Si4O22 P 2₁/a (pseudo-C 2/m) 2/m

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

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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Rengeite

Sr4ZrTi4Si4O22
Dana No: 56.02.08.05 Strunz No: 09.BE.70
Locality:

Notes: