[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts] See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM] Mineral News was founded some twenty years ago and has developed a following of avid mineral collectors seeking timely information about new finds and other items of interest to the collector community. Articles are solicited from collector and scientific authors. General Ishikawaite Information(U,Fe,Y,Ca)(Nb,Ta)O4 (?) |
Molecular Weight = 294.45 gm |
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Calcium 1.36 % Ca 1.90 % CaO |
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Yttrium 6.04 % Y 7.67 % Y2O3 |
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Uranium 24.25 % U 27.51 % UO2 |
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Tantalum 15.36 % Ta 18.76 % Ta2O5 |
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Niobium 23.66 % Nb 33.85 % Nb2O5 |
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Iron 7.59 % Fe 9.76 % FeO |
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Oxygen 21.73 % O |
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______ ______ |
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100.00 % 99.46 % = TOTAL OXIDE |
U0.3Fe2+0.4Y0.2Ca0.1Nb0.75Ta0.25O4 |
In pegmatites. |
Valid Species (Pre-IMA) 1922 |
Ishikawa, Ivaki Province, Japan. Link to MinDat.org Location Data. |
Named after its locality. |
Ishikawaite + Pronunciation |
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Ishikawaite Crystallography OrthorhombicSpace Group: Unk |
| Physical Properties of IshikawaiteNone |
Black. |
6.2 - 6.4, Average = 6.3 |
Opaque |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
Metamict - Mineral originally crystalline, now amorphous due to radiation damage. |
5-6 - Between Apatite and Orthoclase |
Resinous |
dark brown |
| Optical Properties of Ishikawaite NCalc= 2.15 - from Gladstone-Dale relationship (KC = 0.1819) where Ncalc=Dmeas*KC+1 |
| Calculated Properties of IshikawaiteBulk Density (Electron Density)=5.51 gm/cc |
note: Specific Gravity of Ishikawaite =6.30 gm/cc. Fermion Index = 0.003495602 |
Boson Index = 0.996504398 PEIshikawaite = 858.78 barns/electron |
U=PEIshikawaite x relectron=4,733.22 barns/cc. |
GRapi = 1,808,443.99 (Gamma Ray American Petroleum Institute Units)
Ishikawaite 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)
16.82 ± 4.20 grams of pure Ishikawaite .
Weight of pure Ishikawaite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.30 gm/cc.* | Ishikawaite Classification08.01.04.01 (08)Multiple Oxides with Nb, Ta, and Ti |
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(08.01)where A BO4 |
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(08.01.04)Dana Group |
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04.DB.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DB -With medium-sized cations; chains of edge-sharing octahedra |
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| Other Ishikawaite InformationNAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) |
Links to other databases for Ishikawaite : |
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 (MinSocAm) 8 - Handbook of Mineralogy (UofA) 9 - MinDAT 10 - MinMax(Deutsch) 11 - MinMax(English) 12 - Mineralienatlas (Deutsch) 13 - QUT Mineral Atlas 14 - Ruff.Info 15 - Uranium Minerals Search for Ishikawaite using: Visit our Advertisers for Ishikawaite : AA Mineral SpecimensB & 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 Ishikawaite Mineral Data : Ask about Ishikawaite here : Print or Cut-and-Paste your Ishikawaite Specimen Label here :
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