Caysichite-(Y) Mineral Data

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

Help on Chemical Formula: Chemical Formula: Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)•3H20
Help on Composition: Composition: Molecular Weight = 819.17 gm
   Calcium      8.81 %  Ca   12.32 % CaO
   Gadolinium   3.84 %  Gd    4.43 % Gd2O3
   Yttrium     21.71 %  Y    27.57 % Y2O3
   Silicon     13.71 %  Si   29.34 % SiO2
   Hydrogen     0.86 %  H     7.69 % H2O
   Carbon       4.88 %  C    17.89 % CO2
   Oxygen      46.19 %  O
              ______        ______ 
              100.00 %       99.23 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y2Ca1.8Gd0.2Si4O10(CO3)3.33(OH)0.33•3.33(H2O)
Help on Environment: Environment: Occurs in granite pegmatite lining cavities.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: Evans-Lou feldspar mine, Portland West Township, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition (Ca, Y, Si, CO3).
Help on Synonym: Synonym: ICSD 200418
  IMA1973-044
  PDF 26-1394
 

Caysichite-(Y) Image

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Caysichite-(Y)

Comments: Brownish inclusions of caysichite-(Y) with white tengerite-(Y) rims.
Location: Mt. Ploskaja, Keivi, Kola, Russia. Scale: Sample Size 2.5x3 cm.
© Diederik Visser

Caysichite-(Y) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.9534:1:0.6982
Help on Cell Dimensions: Cell Dimensions: a = 13.3, b = 13.95, c = 9.74, Z = 4; V = 1,807.11 Den(Calc)= 3.01
Help on Crystal System: Crystal System: Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Ccm21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.93(1), 3.32(0.9), 4.38(0.6),
Click Here for Large Caysichite-(Y) Structure Window Crystal Structure:

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Mellini M , Merlino S , The Canadian Mineralogist , 16 (1978) p.81-88, Caysichite: A double crankshaft chain structure

 

Physical Properties of Caysichite-(Y)

Help on Cleavage: Cleavage: {010} Indistinct
Help on Color: Color: Colorless, Green, Greenish yellow, White, Light yellow.
Help on Density: Density: 3.03
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Pulverulent - Forms a loose, poorly-coherent powdery mass.
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Habit: Habit: Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luminescence: Luminescence: Cathodoluminescence.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Caysichite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2022,KPDmeas= 0.2009,KC= 0.2031
Ncalc = 1.61 - 1.62
Help on Optical Data: Optical Data: Biaxial (-), a=1.586-1.589, b=1.614-1.616, g=1.621-1.626, bire=0.0350-0.0370, 2V(Calc)=52-60, 2V(Meas)=61.
 

Calculated Properties of Caysichite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Caysichite-(Y) =3.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PECaysichite-(Y) = 53.39 barns/electron
U=PECaysichite-(Y) x relectron= 156.54 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,989.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Caysichite-(Y) per GRapi unit = 250.69 (PPM)

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

Estimated Radioactivity from Caysichite-(Y) - 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 / 8.59 cm 85,999 2.32E-06 3,989.05 1.31
100 gm / 3.99 cm 8,600 2.32E-07 398.90 0.13
10 gm / 1.85 cm 860 2.32E-08 39.89 0.01
1 gm / 8.59 mm 86 2.32E-09 3.99 0.00
0.1 gm / 3.99 mm 9 2.32E-10 0.40 0.00
0.01 gm / 1.85 mm 1 2.32E-11 0.04 0.00
0.001 gm / 0.86 mm 0 2.32E-12 0.00 0.00

Weight of pure Caysichite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.01 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 ( 0.19 % Th) From Sum REE Elements ( 3.84 % REE)
 

Caysichite-(Y) Classification
Help on Dana Class: Dana Class: 70.01.02.02 (70)Inosilicate Column or Tube Structures
  (70.01)with columnar silicate units
  (70.01.02)Double crankshaft chains
 
70.01.02.01 Narsarsukite Na2(Ti,Fe)Si4(O,F)11 I 4/m 4/m
 
70.01.02.02 Caysichite-(Y) Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)•3H20 Ccm21 mm2
 
70.01.02.03 Charoite K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)•3(H2O) P*/4 ((pseudo Ortho) 2/m
Help on Strunz Class: Strunz Class: 09.DJ.15 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DJ -Inosilicates with 4-periodic double and triple chains
 
09.DJ.15 Caysichite-(Y) Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)•3H20 Ccm21 mm2
 

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

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

Caysichite-(Y)

Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)•3H20
Dana No: 70.01.02.02 Strunz No: 09.DJ.15
Locality:

 

Notes: