Gerenite-(Y) Mineral Data

Gerenite-(Y) Mineral Data
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General Gerenite-(Y) Information

Help on Chemical Formula: Chemical Formula: (Ca,Na)2(Y,REE)3Si6O18•2(H2O)
Help on Composition: Composition: Molecular Weight = 872.18 gm
   Sodium            1.32 %  Na    1.78 % Na2O
   Calcium           6.89 %  Ca    9.64 % CaO
   La,Ce,Pr,Nd,Sm,  12.38 %  RE   14.45 % REE2O3
   Yttrium          22.94 %  Y    29.13 % Y2O3
   Silicon          19.32 %  Si   41.33 % SiO2
   Hydrogen          0.46 %  H     4.13 % H2O
   Oxygen           36.69 %  O
                   ______        ______ 
                   100.00 %      100.46 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.5Na0.5Y2.25REE0.75Si6O18•2(H2O)
Help on Environment: Environment: Cyclosilicate with structural similarities to kainosite-(Y) and leifite. Found in an aplite-pegmatite lens.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Strange Lake perialkaline complex on the Quebec-Labrador border, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Richard Geren (1917-), former executive vice-president of the Iron Ore Company of Canada. Mr. Geren initiated and supported the exploration program of the Strange Lake deposit.
Help on Name Pronunciation: Name Pronunciation: Gerenite-(Y) Say GERENITE-(Y)
Help on Synonym: Synonym: ICSD 85571
  IMA1993-034
 

Gerenite-(Y) Image

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Gerenite-(Y)

Comments: BSE image of eutectoid intergrowth of quartz (black) and gerenite-(Y) (white). (CanMin, v36:793).
Location: Strange Lake peralkaline complex, Quebec-Labrador boundary, Canada. Scale: Scale Bar 100 µm.
© Canadian Mineralogist

Gerenite-(Y) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.9546:1:0.5689
Help on Cell Dimensions: Cell Dimensions: a = 9.245, b = 9.684, c = 5.51, Z = 1; alpha = 97.44°, beta = 100.4°, gamma = 116.7° V = 429.81 Den(Calc)= 3.37
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
Click Here for Large Gerenite-(Y) Structure Window Crystal Structure:

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Groat L A , The Canadian Mineralogist , 36 (1998) p.801-808, The crystal structure of gerenite-(Y), (Ca,Na)2(Y,REE)3Si6O18.2H2O,, a cyclosilicate mineral

 

Physical Properties of Gerenite-(Y)

Help on Cleavage: Cleavage: {101} Indistinct
Help on Color: Color: White, Cream white.
Help on Density: Density: 3.3 - 3.52, Average = 3.41
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
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 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Gerenite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.073 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.081 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1764,KPDmeas= 0.1779,KC= 0.192
Ncalc = 1.63 - 1.68
Help on Optical Data: Optical Data: Biaxial (-), a=1.602, b=1.607, g=1.611, bire=0.0090
 

Calculated Properties of Gerenite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.26 gm/cc
note: Specific Gravity of Gerenite-(Y) =3.41 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEGerenite-(Y) = 103.19 barns/electron
U=PEGerenite-(Y) x relectron= 336.47 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 12,675.35 (Gamma Ray American Petroleum Institute Units)
Concentration of Gerenite-(Y) per GRapi unit = 78.89 (PPM)

Gerenite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Gerenite-(Y) - weak
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 / 8.24 cm 278,369 7.52E-06 12,675.35 4.17
100 gm / 3.83 cm 27,837 7.52E-07 1,267.54 0.42
10 gm / 1.78 cm 2,784 7.52E-08 126.75 0.04
1 gm / 8.24 mm 278 7.52E-09 12.68 0.00
0.1 gm / 3.83 mm 28 7.52E-10 1.27 0.00
0.01 gm / 1.78 mm 3 7.52E-11 0.13 0.00
0.001 gm / 0.82 mm 0 7.52E-12 0.01 0.00

Weight of pure Gerenite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.41 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 ( 0.62 % Th) From Sum REE Elements (12.38 % REE)
 

Gerenite-(Y) Classification
Help on Dana Class: Dana Class: 61.01.06.01 (61)Cyclosilicate Six-Membered Rings
  (61.01)with [Si6O18] rings; possible (OH) and Al substitution
  (61.01.06)Dana Group
 
61.01.06.01 Gerenite-(Y)! (Ca,Na)2(Y,REE)3Si6O18•2(H2O) P1 1
Help on Strunz Class: Strunz Class: 09.CJ.45 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe),
 
09.CJ.45 Gerenite-(Y)! (Ca,Na)2(Y,REE)3Si6O18•2(H2O) P1 1
 

Other Gerenite-(Y) Information
Help on References: References: NAME( Dana8) PHYS. PROP.(MinRec) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Gerenite-(Y) :
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
11 - WWW-MINCRYST

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Print or Cut-and-Paste your Gerenite-(Y) Specimen Label here :

Gerenite-(Y)

(Ca,Na)2(Y,REE)3Si6O18•2(H2O)
Dana No: 61.01.06.01 Strunz No: 09.CJ.45
Locality:

 

Notes: