Melanocerite-(Ce) Mineral Data (original) (raw)

General Melanocerite-(Ce) Information

Help on Chemical Formula: Chemical Formula:

(Ce,Th,Ca)5(Si,B)3O12(OH,F)•n(H2O) (?)

Help on Composition: Composition:

Molecular Weight = 903.06 gm

Calcium 4.88 % Ca 6.83 % CaO

Lanthanum 10.77 % La 12.63 % La2O3

Cerium 46.55 % Ce 54.52 % Ce2O3

Thorium 5.14 % Th 5.85 % ThO2

Silicon 6.22 % Si 13.31 % SiO2

Boron 1.20 % B 3.85 % B2O3

Hydrogen 0.28 % H 2.49 % H2O

Oxygen 23.92 % O

Fluorine 1.05 % F 1.05 % F

- % F -0.44 % -O=F2

______ ______

100.00 % 100.09 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Ce3La0.7Th0.2Ca1.1Si2BO12(OH)0.5F0.5•(H2O)

Help on Environment: Environment:

Alkalic rocks and their cogenetic pegmatites. Also in metamorphosed alkalic rocks.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1887

Help on Locality: Locality:

Isle of Kjeo in the Langesundfiord district, southern Norway. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named from the Greek meaning "black" and the composition (Cerium).

Help on Name Pronunciation: Name Pronunciation:

Melanocerite-(Ce) + Pronunciation Say MELANOCERITE-(CE)

Melanocerite-(Ce) Image

Click Here for Larger Melanocerite-(Ce) Image in a New Browser Window Images:

Click Here for Larger Melanocerite-(Ce) Image Melanocerite-(Ce) Comments: Black, vitreous, crystalline aggregates of melanocerite-(Ce) in matrix. Location: Cardiff Uranium mine, Wilberforce, Monmouth Township, Haliburton Co., Ontario, Canada.Scale: See Image. © Paul M. Schumacher

Melanocerite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios:

a:c = 1:0.73582

Help on Cell Dimensions: Cell Dimensions:

a = 9.35, c = 6.88, Z = 2; V = 520.89 Den(Calc)= 5.76

Help on Crystal System: Crystal System:

TrigonalSpace Group: Unk (HEX-R)

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.81(1), 1.84(0.4), 3.44(0.4),

Physical Properties of Melanocerite-(Ce)

Help on Cleavage: Cleavage:

None

Help on Color: Color:

Brown, Black, Dark brown, Reddish brown.

Help on Density: Density:

4.13

Help on Diaphaneity: Diaphaneity:

Subtransparent to opaque

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:

Tabular - Form dimensions are thin in one direction.

Help on Hardness: Hardness:

5-6 - Between Apatite and Orthoclase

Help on Luminescence: Luminescence:

Radioactive.

Help on Luster: Luster:

Resinous

Help on Streak: Streak:

light brown

Optical Properties of Melanocerite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= -0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.243 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1259,KPDmeas= 0.1755,KC= 0.1662
Ncalc = 1.69 - 1.96

Help on Optical Data: Optical Data:

Uniaxial (-), e=1.72, w=1.73, bire=0.0100.

Calculated Properties of Melanocerite-(Ce)

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.68 gm/cc
note: Specific Gravity of Melanocerite-(Ce) =4.13 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.0055649447
Boson Index = 0.9944350553

Help on Photoelectric: Photoelectric:

PEMelanocerite-(Ce) = 415.84 barns/electron
U=PEMelanocerite-(Ce) x relectron=1,528.65 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 97,579.54 (Gamma Ray American Petroleum Institute Units)
Concentration of Melanocerite-(Ce) per GRapi unit = 10.25 (PPM)

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

Estimated Maximum U.S. Postal Shipping Size(10 mRem/hr limit, Unshielded 10 cm box) 311.71 ± 77.93 grams of pure Melanocerite-(Ce) .

Estimated Radioactivity from Melanocerite-(Ce) - weak

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor One Hour
1000 gm / 7.73 cm 2,302,230 6.22E-05 97,579.54 32.08
100 gm / 3.59 cm 230,223 6.22E-06 9,757.95 3.21
10 gm / 1.67 cm 23,022 6.22E-07 975.80 0.32
1 gm / 7.73 mm 2,302 6.22E-08 97.58 0.03
0.1 gm / 3.59 mm 230 6.22E-09 9.76 0.00
0.01 gm / 1.67 mm 23 6.22E-10 0.98 0.00
0.001 gm / 0.77 mm 2 6.22E-11 0.10 0.00

Weight of pure Melanocerite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.13 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

Melanocerite-(Ce) Classification

Help on Dana Class: Dana Class:

54.02.05.03 (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.AJ.20 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,

09.AJ.20 Bakerite Ca4B4(BO4)(SiO4)3(OH)3•(H2O) P 21/c 2/m

09.AJ.20 Calcybeborosilite-(Y)! (REE,Ca)2[](B,Be)2(SiO4)2(OH,O)2 P 21/a 2/m

09.AJ.20 Calciogadolinite? CaREE(Fe)Be2Si2O10 P 21/a 2/m

09.AJ.20 Datolite CaBSiO4(OH) P 21/c 2/m

09.AJ.20 Hingganite-(Yb) (Yb,Y)2([])Be2Si2O8(OH)2 P 21/a 2/m

09.AJ.20 Homilite Ca2(Fe,Mg)B2Si2O10 P 21/a 2/m

09.AJ.20 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 21/c 2/m

09.AJ.20 Gadolinite-(Y) Y2FeBe2Si2O10 P 21/a 2/m

09.AJ.20 Hingganite-(Ce) (Ce,Ca)2([],Fe)Be2Si2O8[(OH),O]2 P 21/a 2/m

09.AJ.20 Hingganite-(Y) Y2([])Be2Si2O8(OH)2 P 21/a 2/m

09.AJ.20 Melanocerite-(Ce) (Ce,Th,Ca)5(Si,B)3O12(OH,F)•n(H2O)(?) Unk (HEX-R) Trig

09.AJ.20 Minasgeraisite-(Y) CaY2Be2Si2O10 P 21/a 2/m

Other Melanocerite-(Ce) Information

Help on References: References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)

Help on See Also: See Also:

Links to other databases for Melanocerite-(Ce) :
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 Melanocerite-(Ce) Specimen Label here :

Melanocerite-(Ce)

(Ce,Th,Ca)5(Si,B)3O12(OH,F)•n(H2O) (?)
Dana No: 54.02.05.03 Strunz No: 09.AJ.20
Locality:

Notes: