Caysichite-(Y) Mineral Data

Caysichite-(Y) Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About



[Newest Minerals] [Minerals for Sale] [Educational Articles] [About Us] [Image Gallery]
John Betts - Fine Minerals
Classic minerals, out-of-print books & magazines, plus informative articles for collectors


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

Click Here for Larger Caysichite-(Y) Image in a New Browser Window Images:
Click Here for Larger Caysichite-(Y) Image

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


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
Bequerols
(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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - MinMax(Deutsch)
10 - MinMax(English)
11 - Mineralienatlas (Deutsch)
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

Search for Caysichite-(Y) using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Caysichite-(Y) :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Caysichite-(Y) Mineral Data :

Ask about Caysichite-(Y) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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: