Rengeite Mineral Data
- ️Dave Barthelmy
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:
Sr3.6Ca0.1REE0.05Zr0.8Ti4.1Si4.1O22
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
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
Crystal Structure:
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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+1Calculated Properties of Rengeite
Electron Density:
Bulk Density (Electron Density)=3.82 gm/ccnote: Specific Gravity of Rengeite =4.08 gm/cc.
Fermion Index:
Fermion Index = 0.05Boson Index = 0.95
Photoelectric:
PERengeite = 50.65 barns/electronU=PERengeite x relectron= 193.39 barns/cc.
Radioactivity:
GRapi = 678.56 (Gamma Ray American Petroleum Institute Units)
Concentration of Rengeite per GRapi unit =1,473.72 (PPM)
- 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
Strunz Class:
09.BE.70 09 - SILICATES (Germanates)
09.B - Sorosilicates
09.BE -Si2O7 groups with additional anions;
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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Ask about Rengeite here :
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Print or Cut-and-Paste your Rengeite Specimen Label here :
Rengeite
Sr4ZrTi4Si4O22Dana No: 56.02.08.05 Strunz No: 09.BE.70
Locality:
Notes: