Mottanaite-(Ce) Mineral Data

Excalibur Minerals

General Mottanaite-(Ce) Information
Chemical Formula:	Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2
Composition:	Molecular Weight = 1,007.13 gm
	Calcium    18.31 %  Ca   25.61 % CaO
	Cerium     20.87 %  Ce   24.44 % Ce2O3
	Thorium     2.30 %  Th    2.62 % ThO2
	Titanium    0.48 %  Ti    0.79 % TiO2
	Beryllium   0.72 %  Be    1.99 % BeO
	Aluminum    1.34 %  Al    2.53 % Al2O3
	Iron        2.22 %  Fe    3.17 % Fe2O3
	Silicon    11.15 %  Si   23.86 % SiO2
	Boron       4.29 %  B    13.83 % B2O3
	Hydrogen    0.05 %  H     0.45 % H2O
	Oxygen     37.33 %  O
	Fluorine    0.94 %  F     0.94 % F
	-   %  F    -0.40 % -O=F2
	______        ______
	100.00 %       99.84 % = TOTAL OXIDE
Empirical Formula:	Ca4Ce1.5Th0.1Ca0.6Al0.5Fe3+0.4Ti0.1Be0.8(Si4B4O22)O(OH)0.5F0.5
Environment:	Miarolitic cavities in alkali-syenitic ejecta enclosed in pyroclastic formations of the Roma Comagmatic Province. (hellandite group; structure)
IMA Status:	Approved IMA 2001 (Dana # Added)
Locality:	Sabatini volcanic complex, Latium, Italy. Link to MinDat.org Location Data.
Name Origin:	Named for Annibale Mottana, Professor of Mineralogy at the University of Roma Tre (Italy).
Synonym:	IMA2001-020
Mottanaite-(Ce) Image
Images:	Mottanaite-(Ce) Comments: Brown crystals of mottanaite-(Ce) in matrix. Location: Monte Cavallucio, Sacrofano, Campagnano, Latium (Lazio), Italy. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Mottanaite-(Ce) Crystallography
Axial Ratios:	a:b:c =4.0101:1:2.1592
Cell Dimensions:	a = 19.032, b = 4.746, c = 10.248, Z = 2; beta = 110.97° V = 864.35 Den(Calc)= 3.87
Crystal System:	Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a
X Ray Diffraction:	By Intensity(I/Io): 2.854(1)(411), 2.646(0.86)(413), 2.916(0.86)(212),3.085(0.85)(412), 2.635(0.84)(611), 2.647(0.84)(013), 3.243(0.8)(410), 3.452(0.67)(2
Physical Properties of Mottanaite-(Ce)
Cleavage:	None
Color:	Pale brown.
Density:	3.61
Diaphaniety:	Transparent
Fracture:	Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Habit:	Anhedral Grains - Granular minerals without the expression of crystal shapes
Habit:	Tabular - Form dimensions are thin in one direction.
Luster:	Vitreous (Glassy)
Optical Properties of Mottanaite-(Ce)
Gladstone-Dale:	CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.093 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1793,KPDmeas= 0.1922,KC= 0.1978
Optical Data:	Biaxial (-), a=1.68, b=1.694, g=1.708, bire=0.0280
Calculated Properties of Mottanaite-(Ce)
Electron Density:	relectron=3.44 gm/cc note: rMottanaite-(Ce) =3.61 gm/cc.
Fermion Index	Fermion Index = 0.02242 Boson Index = 0.97758
Photoelectric:	PEMottanaite-(Ce) = 155.80 barns/electron U=PEMottanaite-(Ce) x relectron= 535.32 barns/cc.
Radioactivity:	GRapi = 46,782.13 (Gamma Ray American Petroleum Institute Units) Mottanaite-(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) 650.18 ±162.54 grams of pure Mottanaite-(Ce) . Estimated Radioactivity from Mottanaite-(Ce) - 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 / 8.09 cm 1,032,165 2.79E-05 46,782.13 15.38 100 gm / 3.75 cm 103,217 2.79E-06 4,678.21 1.54 10 gm / 1.74 cm 10,322 2.79E-07 467.82 0.15 1 gm / 8.09 mm 1,032 2.79E-08 46.78 0.02 0.1 gm / 3.75 mm 103 2.79E-09 4.68 0.00 0.01 gm / 1.74 mm 10 2.79E-10 0.47 0.00 0.001 gm / 0.81 mm 1 2.79E-11 0.05 0.00 Weight of pure Mottanaite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.61 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
Mottanaite-(Ce) Classification
Dana Class:	54.2.2.5 (54)Nesosilicate Borosilicates and Some Beryllosilicates
	(54.2)with B in [4] coordination
	(54.2.2)Hellandite group
	54.2.2.1 Hellandite-(Y) (Ca,REE)4(Y,Ce)2(Al,[])2[Si4B4O22](OH)2 P 2/a 2/m
	54.2.2.2 Tadzhikite-(Y)! Ca4(Y,Ce)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
	54.2.2.3 Tadzhikite-(Ce) Ca4(Ce,Y)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
	54.2.2.4 Hellandite-(Ce)! (Ca3REE)4Ce2Al[]2[Si4B4O22](OH)2 P 2/a 2/m
	54.2.2.5 Mottanaite-(Ce) ! Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2 P 2/a 2/m
	54.2.2.6 Ciprianiite! Ca4[(Th,U)(REE)]2(Al,[])2[Si4B4O22](OH,F)2 P 2/a 2/m
Strunz Class:	VIII/F.36-30 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 Mottanaite-(Ce) Information
References:	NAME( AmMin, Vol 87, p 739) PHYS. PROP.(AmMin, Vol 87, p 739) OPTIC PROP.(AmMin, Vol 87, p 739)
See Also:	Links to other databases for Mottanaite-(Ce) : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas Search for Mottanaite-(Ce) using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Mottanaite-(Ce) : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Mottanaite-(Ce) Mineral Data : Ask about Mottanaite-(Ce) 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 Español Print or Cut-and-Paste your Mottanaite-(Ce) Specimen Label here : Mottanaite-(Ce) Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2 Dana No: 54.2.2.5 Strunz No: VIII/F.36-30 Locality:   Notes: