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Tritomite-(Y) Mineral Data

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General Tritomite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Y,Ca,La,Fe++)5(Si,B,Al)3(O,OH,F)13 (?)
Help on Composition: Composition: Molecular Weight = 693.60 gm
   Calcium     8.67 %  Ca   12.13 % CaO
   Lanthanum  20.03 %  La   23.49 % La2O3
   Yttrium    25.64 %  Y    32.56 % Y2O3
   Aluminum    1.17 %  Al    2.21 % Al2O3
   Iron        4.03 %  Fe    5.18 % FeO
   Silicon     8.10 %  Si   17.33 % SiO2
   Boron       1.09 %  B     3.51 % B2O3
   Hydrogen    0.44 %  H     3.90 % H2O
   Oxygen     25.37 %  O
   Fluorine    5.48 %  F     5.48 % F
                -   %   F    -2.31 % -O=F2    
             ______        ______ 
             100.00 %      103.46 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: 5(Y0.4)5(Ca0.3)5(La0.2)5(Fe2+0.1)Si2B0.7Al0.3O8(OH)3F2
Help on Environment: Environment: Granite pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1962
Help on Locality: Locality: Cranberry Lake, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for "three" and "to cut," in allusion to the trihedral cavities left in the host rock by the crystals.
Help on Name Pronunciation: Name Pronunciation: Tritomite-(Y) + Pronunciation Say TRITOMITE-(Y)
Help on Synonym: Synonym: Spenceite
 

Tritomite-(Y) Image

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  Tritomite-(Y)

Comments: Massive, resinous spencite (Tritomite-(Y)), with brown zircon crystals..
Location: BEMCO prospect (Charlotte Mine), Cranberry Lake, Byram Township, Sussex Co., New Jersey, USA. Scale: Sample Size 2.0 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Tritomite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.7339
Help on Cell Dimensions: Cell Dimensions: a = 9.32, c = 6.84, Z = 2; V = 514.54 Den(Calc)= 4.48
Help on Crystal System: Crystal System: Hexagonal - Dipyramidal H-M Symbol (6/m) Space Group: P 63/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.78(1), 3.13(0.5), 4.02(0.5),
 

Physical Properties of Tritomite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Greenish black, Dark green black, Reddish brown.
Help on Density: Density: 3.05 - 3.4, Average = 3.22
Help on Diaphaneity: Diaphaneity: Translucent to Subopaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Habit: Habit: Pyramidal - Crystals are shaped like pyramids.
Help on Hardness: Hardness: 3.5-6.5
Help on Luster: Luster: Vitreous - Resinous
 

Optical Properties of Tritomite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.147 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.175 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1563,KPDmeas= 0.2171,KC= 0.1893
Ncalc = 1.58 - 1.85
Help on Optical Data: Optical Data: Isotropic, n=1.63-1.77.
 

Calculated Properties of Tritomite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.00 gm/cc
note: Specific Gravity of Tritomite-(Y) =3.23 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0072261677
Boson Index = 0.9927738323
Help on Photoelectric: Photoelectric: PETritomite-(Y) = 127.77 barns/electron
U=PETritomite-(Y) x relectron= 383.06 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 19,858.64 (Gamma Ray American Petroleum Institute Units)
Concentration of Tritomite-(Y) per GRapi unit = 50.36 (PPM)

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

Estimated Radioactivity from Tritomite-(Y) - weak
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 / 8.40 cm 448,596 1.21E-05 19,858.64 6.53
100 gm / 3.90 cm 44,860 1.21E-06 1,985.86 0.65
10 gm / 1.81 cm 4,486 1.21E-07 198.59 0.07
1 gm / 8.40 mm 449 1.21E-08 19.86 0.01
0.1 gm / 3.90 mm 45 1.21E-09 1.99 0.00
0.01 gm / 1.81 mm 4 1.21E-10 0.20 0.00
0.001 gm / 0.84 mm 0 1.21E-11 0.02 0.00

Weight of pure Tritomite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.23 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 ( 1.00 % Th) From Sum REE Elements (20.03 % REE)
 

Tritomite-(Y) Classification

Help on  Dana Class: Dana Class: 54.02.05.02 (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.02)with B in [4] coordination
  (54.02.05)Tritomite group
 
54.02.05.01 Tritomite-(Ce) (Ce,La,Ca,Y,Th)5(Si,B)3(O,OH,F)13 P 63/m 6/m
 
54.02.05.02 Tritomite-(Y) (Y,Ca,La,Fe)5(Si,B,Al)3(O,OH,F)13(?) P 63/m 6/m
 
54.02.05.03 Melanocerite-(Ce) (Ce,Th,Ca)5(Si,B)3O12(OH,F)•n(H2O)(?) Unk (HEX-R) Trig
Help on  Strunz Class: Strunz Class: 09.AH.30 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AH -Nesosilicates with CO3, SO4, PO4, etc.
 
09.AH.30 Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 63/m 6/m
 
09.AH.30 Tritomite-(Ce) (Ce,La,Ca,Y,Th)5(Si,B)3(O,OH,F)13 P 63/m 6/m
 
09.AH.30 Tritomite-(Y) (Y,Ca,La,Fe)5(Si,B,Al)3(O,OH,F)13(?) P 63/m 6/m
 

Other Tritomite-(Y) Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Tritomite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Tritomite-(Y)

(Y,Ca,La,Fe++)5(Si,B,Al)3(O,OH,F)13 (?)
Dana No: 54.02.05.02 Strunz No: 09.AH.30
Locality:

 

Notes:

 

 
   
 


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