Hundholmenite-(Y) Mineral Data

[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 Hundholmenite-(Y) Information

Chemical Formula:

(Y,REE,Ca,Na)15(Al,Fe+++)CaxAs+++1-x(Si,As+++++)Si6B3(O,F)48

Composition:

Molecular Weight = 2,521.06 gm

Sodium 0.91 % Na 1.23 % Na₂O

Calcium 5.56 % Ca 7.79 % CaO

La,Ce,Pr,Nd,Sm, 28.56 % RE 33.32 % REE₂O₃

Yttrium 21.16 % Y 26.87 % Y₂O₃

Aluminum 0.80 % Al 1.52 % Al₂O₃

Iron 0.55 % Fe 0.79 % Fe₂O₃

Silicon 7.52 % Si 16.09 % SiO₂

Boron 1.29 % B 4.14 % B₂O₃

Arsenic 2.23 % As 1.96 % As₂O₃ / 1.14 % As₂O₅

Oxygen 25.39 % O

Fluorine 6.03 % F 6.03 % F

- % F -2.54 % -O=F₂

______ ______

100.00 % 98.33 % = TOTAL OXIDE

Empirical Formula:

Y₆REE₅Ca₃NaAl_0.75Fe³⁺_0.25Ca_0.5As_0.5Si_0.75As_0.25Si₆B₃O₄₀F₈

Environment:

Found embedded in REE-bearing fluorite, in a granitic pegmatite. Vicanite group.

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Hundholmen, Tysfjord, Nordland, north Norway. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2006-005

Search for Hundholmenite-(Y) Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Hundholmenite-(Y) Crystallography

Axial Ratios:

a:c = 1:2.53114

Cell Dimensions:

a = 10.675, c = 27.02, Z = 3; V = 2,666.56 Den(Calc)= 4.71

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 2.972(1), 2.947(0.76), 2.924(0.66),3.114(0.43), 1.978(0.37), 2.681(0.36), 4.38(0.33), 3.095(0.29),

Physical Properties of Hundholmenite-(Y)

Color:

Pale brown.

Diaphaneity:

Transparent

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Optical Properties of Hundholmenite-(Y)

Gladstone-Dale:

CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1599,KC= 0.1651
Ncalc = 1.78

Optical Data:

Uniaxial (-).

Calculated Properties of Hundholmenite-(Y)

Electron Density:

Bulk Density (Electron Density)=4.34 gm/cc
note: Specific Gravity of Hundholmenite-(Y) =4.71 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_{Hundholmenite-(Y)}= 205.22 barns/electron
U=PE_{Hundholmenite-(Y)} x r_electron= 891.43 barns/cc.

Radioactivity:

GRapi = 28,195.18 (Gamma Ray American Petroleum Institute Units)
Concentration of Hundholmenite-(Y) per GRapi unit = 35.47 (PPM)

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

**Estimated Radioactivity from Hundholmenite-(Y)** - 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 / 7.40 cm	642,028	1.74E-05	28,195.18	9.27
100 gm / 3.44 cm	64,203	1.74E-06	2,819.52	0.93
10 gm / 1.59 cm	6,420	1.74E-07	281.95	0.09
1 gm / 7.40 mm	642	1.74E-08	28.20	0.01
0.1 gm / 3.44 mm	64	1.74E-09	2.82	0.00
0.01 gm / 1.59 mm	6	1.74E-10	0.28	0.00
0.001 gm / 0.74 mm	1	1.74E-11	0.03	0.00

Weight of pure Hundholmenite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.71 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 ( 1.43 % Th) From Sum REE Elements (28.56 % REE)

Hundholmenite-(Y) Classification

Dana Class:

54.03.01.02 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.03)Dana Type

(54.03.01)Vicanite Group

54.03.01.01 Vicanite-(Ce) (Ca,Ce,La,Th)15As(As0.5,Na0.5)FeSi6B4O40F7 R 3m 3m

54.03.01.02 Hundholmenite-(Y)! (Y,REE,Ca,Na)15(Al,Fe)CaxAs1-x(Si,As)Si6B3(O,F)48 R 3m 3m

54.03.01.03 Proshchenkoite-(Y)! (Y,REE,Ca,Na,Mn)15FeCa(P,Si)Si6B3(O,F)48 R 3m 3m

Strunz Class:

09.AJ.35 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,

09.AJ.35 Okanoganite-(Y) (Na,Ca)3(Y,Ce)12Si6B2O27F14 R 3m 3m

09.AJ.35 Vicanite-(Ce) (Ca,Ce,La,Th)15As(As0.5,Na0.5)FeSi6B4O40F7 R 3m 3m

09.AJ.35 Hundholmenite-(Y)! (Y,REE,Ca,Na)15(Al,Fe)CaxAs1-x(Si,As)Si6B3(O,F)48 R 3m 3m

09.AJ.35 Proshchenkoite-(Y)! (Y,REE,Ca,Na,Mn)15FeCa(P,Si)Si6B3(O,F)48 R 3m 3m

Other Hundholmenite-(Y) Information

References:

NAME( MinMag v71:179) PHYS. PROP.(MinMag v71:179) OPTIC PROP.(MinMag v71:179)

See Also:

Links to other databases for Hundholmenite-(Y) :
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
10 - Ruff.Info

Search for Hundholmenite-(Y) using:

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

Visit our Advertisers for Hundholmenite-(Y) :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Hundholmenite-(Y) Mineral Data :

Ask about Hundholmenite-(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 Español

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

Hundholmenite-(Y)

(Y,REE,Ca,Na)15(Al,Fe+++)CaxAs+++1-x(Si,As+++++)Si6B3(O,F)48
Dana No: 54.03.01.02 Strunz No: 09.AJ.35
Locality:

Notes: