Ancylite-(La) Mineral Data

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General Ancylite-(La) Information

Chemical Formula:

Sr(La,Ce)(CO3)2(OH)•(H2O)

Composition:

Molecular Weight = 381.87 gm

Strontium 22.95 % Sr 27.13 % SrO

Lanthanum 27.28 % La 31.99 % La₂O₃

Cerium 9.17 % Ce 10.74 % Ce₂O₃

Hydrogen 0.79 % H 7.08 % H₂O

Carbon 6.29 % C 23.05 % CO₂

Oxygen 33.52 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SrLa_0.75Ce_0.25(CO₃)₂(OH)•(H₂O)

Environment:

In hydrothermal veins in nepheline syenites.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Marchenko Peak, Mount Kukisvumchorr, Khibina massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition and from the Greek "curved," in allusion to the rounded and distorted character of the crystals.

Name Pronunciation:

Ancylite-(La)

Synonym:

IMA1995-053

Ancylite-(La) Image

Images:

Ancylite-(La)

Comments: Pale brown aggregates of ancylite-(La) crystals with some aegirine on matrix.
Location: Mt. Kukisvumchorr, Chibiny, Kola, Russia. Scale: Specimen Size 2.5x3.5 cm.
© Diederik Visser

Ancylite-(La) Crystallography

Axial Ratios:

a:b:c =0.5905:1:0.8471

Cell Dimensions:

a = 5.072, b = 8.589, c = 7.276, Z = 2; V = 316.97 Den(Calc)= 4.00

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmcn

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

By Intensity(I/I_o): 2.955(1), 4.36(0.92), 3.705(0.9),

Crystal Structure:

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Petersen O V , Niedermayr G , Gault R A , Brandstatter F , Micheelsen H I , Giester G , Neues Jahrbuch fur Mineralogie, Monatshefte , 2001 (2001) p.493-504, Ancylite-(La) from the Ilimaussaq alkaline complex, South Greenland, Locality: Ilimaussaq alkaline complex, South Greenland

Physical Properties of Ancylite-(La)

Cleavage:

None

Color:

Yellow, Yellowish brown.

Density:

3.88

Diaphaneity:

Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Pyramidal - Crystals are shaped like pyramids.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ancylite-(La)

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1699,KPDmeas= 0.1752,KC= 0.1749
Ncalc = 1.68 - 1.7

Optical Data:

Biaxial (+), a=1.64, b=1.668, g=1.731, bire=0.0910, 2V(Calc)=70, 2V(Meas)=70. Dispersion r < v moderate.

Calculated Properties of Ancylite-(La)

Electron Density:

Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Ancylite-(La) =3.88 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Ancylite-(La)}= 201.59 barns/electron
U=PE_{Ancylite-(La)} x r_electron= 713.81 barns/cc.

Radioactivity:

GRapi = 35,486.80 (Gamma Ray American Petroleum Institute Units)
Concentration of Ancylite-(La) per GRapi unit = 28.18 (PPM)

Ancylite-(La) 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) 857.13 ±214.28 grams of pure Ancylite-(La) .

**Estimated Radioactivity from Ancylite-(La)** - 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 / 7.90 cm	816,578	2.21E-05	35,486.80	11.67
100 gm / 3.66 cm	81,658	2.21E-06	3,548.68	1.17
10 gm / 1.70 cm	8,166	2.21E-07	354.87	0.12
1 gm / 7.90 mm	817	2.21E-08	35.49	0.01
0.1 gm / 3.66 mm	82	2.21E-09	3.55	0.00
0.01 gm / 1.70 mm	8	2.21E-10	0.35	0.00
0.001 gm / 0.79 mm	1	2.21E-11	0.04	0.00

Weight of pure Ancylite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.88 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 ( 1.82 % Th) From Sum REE Elements (36.45 % REE)

Ancylite-(La) Classification

Dana Class:

16b.01.01.05 (16b)Carbonates - Hydroxyl or Halogen

(16b.01)where (A)m (B)n (XO3)p Zq, with (m+n):p=1:1

(16b.01.01)Ancylite group

16b.01.01.01 Ancylite-(Ce) SrCe(CO3)2(OH)•(H2O) Pmcn 2/m 2/m 2/m

16b.01.01.02 Calcioancylite-(Ce) CaCe(CO3)2(OH)•(H2O) P mmm 2/m 2/m 2/m

16b.01.01.03 Calcioancylite-(Nd) CaNd(CO3)2(OH)•(H2O) Pm m

16b.01.01.04 Gysinite-(Nd) Pb(Nd,La)(CO3)2(OH)•(H2O) Pmcn 2/m 2/m 2/m

16b.01.01.05 Ancylite-(La)! Sr(La,Ce)(CO3)2(OH)•(H2O) Pmcn 2/m 2/m 2/m

16b.01.01.06 Kozoite-(Nd)! (Nd,La,Sm,Pr)(CO3)(OH) Pmcn 2/m 2/m 2/m

16b.01.01.07 Kozoite-(La)! La(CO3)(OH) Pmcn 2/m 2/m 2/m

Strunz Class:

05.DC.05 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DC -With large cations

05.DC.05 Ancylite-(Ce) SrCe(CO3)2(OH)•(H2O) Pmcn 2/m 2/m 2/m

05.DC.05 Ancylite-(La)! Sr(La,Ce)(CO3)2(OH)•(H2O) Pmcn 2/m 2/m 2/m

05.DC.05 Gysinite-(Nd) Pb(Nd,La)(CO3)2(OH)•(H2O) Pmcn 2/m 2/m 2/m

05.DC.05 Calcioancylite-(Ce) CaCe(CO3)2(OH)•(H2O) P mmm 2/m 2/m 2/m

05.DC.05 Calcioancylite-(Nd) CaNd(CO3)2(OH)•(H2O) Pm m

05.DC.05 Kozoite-(La)! La(CO3)(OH) Pmcn 2/m 2/m 2/m

05.DC.05 Kozoite-(Nd)! (Nd,La,Sm,Pr)(CO3)(OH) Pmcn 2/m 2/m 2/m

Other Ancylite-(La) Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p652,1998) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Ancylite-(La) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
11 - Uranium Minerals
12 - WWW-MINCRYST

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Ancylite-(La)

Sr(La,Ce)(CO3)2(OH)•(H2O)
Dana No: 16b.01.01.05 Strunz No: 05.DC.05
Locality:

Notes: