Caysichite-(Y) Mineral Data

Caysichite-(Y) Mineral Data

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General Caysichite-(Y) Information

Chemical Formula:

Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)·3H20

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

Empirical Formula:

Y₂Ca_1.8Gd_0.2Si₄O₁₀(CO₃)_3.33(OH)_0.33·3.33(H₂O)

Environment:

Occurs in granite pegmatite lining cavities.

IMA Status:

Approved IMA 1974

Locality:

Evans-Lou feldspar mine, Portland West Township, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the composition (Ca, Y, Si, CO3).

Synonym:

ICSD 200418

IMA1973-044

PDF 26-1394

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Caysichite-(Y) Crystallography

Axial Ratios:

a:b:c =0.9534:1:0.6982

Cell Dimensions:

a = 13.3, b = 13.95, c = 9.74, Z = 4; V = 1,807.11 Den(Calc)= 3.01

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Ccm21

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 6.93(1), 3.32(0.9), 4.38(0.6),

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)

Cleavage:

[010] Indistinct

Color:

Colorless, Green, Greenish yellow, White, Light yellow.

Density:

3.03

Diaphaniety:

Transparent

Habit:

Pulverulent - Forms a loose, poorly-coherent powdery mass.

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Habit:

Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Cathodoluminescence.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Caysichite-(Y)

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

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)

Electron Density:

r_electron=2.93 gm/cc
note: r_{Caysichite-(Y)}=3.01 gm/cc.

Fermion Index

Fermion Index = 0.0339
Boson Index = 0.9661

Photoelectric:

PE_{Caysichite-(Y)}= 53.39 barns/electron
U=PE_{Caysichite-(Y)} x r_electron= 156.54 barns/cc.

Radioactivity:

GRapi = 3,989.05 (Gamma Ray American Petroleum Institute Units)

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

Dana Class:

70.1.2.2 (70)Inosilicate Column or Tube Structures

(70.1)with columnar silicate units

(70.1.2)Double crankshaft chains

70.1.2.1 Narsarsukite Na2(Ti,Fe)Si4(O,F)11 I 4/m 4/m

70.1.2.2 Caysichite-(Y) Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)·3H20 Ccm21 mm2

70.1.2.3 Charoite K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)·3(H2O) P*/4 ((pseudo Ortho) 2/m

Strunz Class:

VIII/F.36-05 VIII - Silicates

VIII/F - Inosilicates (chain and band) complex chain structure. Cylindric chains and others

VIII/F.36 - Caysichite-(Y) - Tadzhikite-(Ce) series

VIII/F.36-02 Grumantite NaHSi2O5·(H2O) F dd2 mm2

VIII/F.36-05 Caysichite-(Y) Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)·3H20 Ccm21 mm2

VIII/F.36-10 Hellandite-(Y) (Ca,REE)4(Y,Ce)2(Al,[])2[Si4B4O22](OH)2 P 2/a 2/m

VIII/F.36-15 Hellandite-(Ce)! (Ca3REE)4Ce2Al[]2[Si4B4O22](OH)2 P 2/a 2/m

VIII/F.36-20 Tadzhikite-(Ce) Ca4(Ce,Y)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m

VIII/F.36-25 Tadzhikite-(Y)! Ca4(Y,Ce)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m

VIII/F.36-30 Mottanaite-(Ce)! Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2 P 2/a 2/m

VIII/F.36-40 Ciprianiite! Ca4[(Th,U)(REE)]2(Al,[])2[Si4B4O22](OH,F)2 P 2/a 2/m

VIII/F.36-60 Ashcroftine-(Y) K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8·8(H2O) I 4/mmm 4/m 2/m 2/m

Other Caysichite-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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Caysichite-(Y)

Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)·3H20
Dana No: 70.1.2.2 Strunz No: VIII/F.36-05
Locality:

Notes: