Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Coffinite

This page is currently not sponsored. Click here to sponsor this page.
Reuben, Clare, Coffin
Formula:
(U4+,Th)(SiO4)1-x(OH)4x
Colour:
Black
Lustre:
Adamantine
Hardness:
5 - 6
Specific Gravity:
5.1
Crystal System:
Tetragonal
Member of:
Name:
named for Reuben Clare Coffin (October 29, 1886-September 10, 1972) for his outstanding geologic studies in southwestern Colorado. Stanolind oil company and consultant to USGS.
This page provides mineralogical data about Coffinite.


Hide all sections | Show all sections

Classification of CoffiniteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.AD.30

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
51.5.2.4

51 : NESOSILICATES Insular SiO4 Groups Only
5 : Insular SiO4 Groups Only with cations in >[6] coordination
14.16.2

14 : Silicates not Containing Aluminum
16 : Silicates of U

Physical Properties of CoffiniteHide

Adamantine
Colour:
Black
Comment:
transmitted light the smaller particles of coffinite-bearing material are pale brown to very dark brown on thin edges;
Hardness:
5 - 6 on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
5.1 g/cm3 (Measured)    

Optical Data of CoffiniteHide

Type:
Uniaxial (+/-)
RI values:
nα = 1.730 - 1.750 nβ = 1.730 - 1.750
Max Birefringence:
δ = 1.730
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of CoffiniteHide

Formula:
(U4+,Th)(SiO4)1-x(OH)4x
IMA Formula:
U[SiO4,(OH)4]
Common Impurities:
Al,Fe,As,V,Pb

Age informationHide

Age range:
Phanerozoic : 266.4 ± 2.6 Ma to 15 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
1~45 MaEoceneChemical age
295 to 15 MaPhanerozoic
3266.4 ± 2.6 MaGuadalupianU–Pb
Sample references:
IDLocalityReference
1Coronation Lode, Geevor Mine, Pendeen, St Just, St Just District, Cornwall, England, UKDarnley, A. G., English, T. H., Sprake, O., Preece, T. H., & Avery, D. (1965). Ages of uraninite and coffinite from south-west England. Mineral. Mag, 34, 159-176.
2Zálesí, Javorník, Olomouc Region, Moravia, Czech RepublicDolní?ek, Zden?k, et al. "Origin of the Zálesí U–Ni–Co–As–Ag/Bi deposit, Bohemian Massif, Czech Republic: fluid inclusion and stable isotope constraints." Mineralium Deposita 44.1 (2009): 81-97.
3Lipovka Mine, Lipovka pegmatite field, Rezh District, Sverdlovskaya Oblast', Middle Urals, Urals Region, RussiaKhiller, V. V., Erokhin, Y. V., Zakharov, A. V., & Ivanov, K. S. (2014, March). Th-U-Pb dating of granite pegmatites from the Lipovskoe ore field (Urals) for three minerals. In Doklady Earth Sciences (Vol. 455, No. 1, p. 323). Springer Science & Business Media.

Crystallography of CoffiniteHide

Crystal System:
Tetragonal
Cell Parameters:
a = 6.97 Å, c = 6.25 Å
Ratio:
a:c = 1 : 0.897
Unit Cell V:
303.63 ų (Calculated from Unit Cell)

Type Occurrence of CoffiniteHide

General Appearance of Type Material:
fine grained
Geological Setting of Type Material:
unoxidized uranium deposit

Other Language Names for CoffiniteHide

German:Coffinit
Simplified Chinese:水硅铀矿
硅铀矿
铀石
Spanish:Coffinita
Traditional Chinese:水矽鈾礦
矽鈾礦
鈾石

Varieties of CoffiniteHide

Zirconian Yttrian CoffiniteThe ZrO2 and Y2O3 contents reach 13.8 and 3.4 wt.%, respectively (René, 2015).

Relationship of Coffinite to other SpeciesHide

Member of:
Other Members of this group:
HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
Stetindite-(Ce)Ce(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
ThoriteTh(SiO4)Tet.
ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd

Common AssociatesHide

Associated Minerals Based on Photo Data:
Uraninite5 photos of Coffinite associated with Uraninite on mindat.org.
Eucairite4 photos of Coffinite associated with Eucairite on mindat.org.
Clausthalite4 photos of Coffinite associated with Clausthalite on mindat.org.
Sabatierite3 photos of Coffinite associated with Sabatierite on mindat.org.
Pitchblende3 photos of Coffinite associated with Pitchblende on mindat.org.
Berzelianite3 photos of Coffinite associated with Berzelianite on mindat.org.
Brannerite2 photos of Coffinite associated with Brannerite on mindat.org.
Tyuyamunite2 photos of Coffinite associated with Tyuyamunite on mindat.org.
Fergusonite-(Y)2 photos of Coffinite associated with Fergusonite-(Y) on mindat.org.
Montmorillonite1 photo of Coffinite associated with Montmorillonite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AD.05LarniteCa2SiO4Mon.
9.AD.10Calcio-olivineCa2SiO4Orth. mmm (2/m 2/m 2/m)
9.AD.15MerwiniteCa3Mg(SiO4)2Mon. 2/m : P21/b
9.AD.20BredigiteCa7Mg(SiO4)4Orth.
9.AD.25AndraditeCa3Fe3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25AlmandineFe2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3Iso.
9.AD.25GoldmaniteCa3V3+2(SiO4)3Iso.
9.AD.25GrossularCa3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AD.25HibschiteCa3Al2(SiO4)3-x(OH)4xIso. m3m (4/m 3 2/m) : Ia3d
9.AD.25HydroandraditeCa3Fe3+2(SiO4)3-x(OH)4x
9.AD.25KatoiteCa3Al2(SiO4)3-x(OH)4xIso.
9.AD.25KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3Iso.
9.AD.25KnorringiteMg3Cr2(SiO4)3Iso.
9.AD.25MajoriteMg3(Fe2+,Si,Al)2(SiO4)3Iso.
9.AD.25MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3Iso.
9.AD.25PyropeMg3Al2(SiO4)3Iso.
9.AD.25SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3Iso.
9.AD.25SpessartineMn2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25UvaroviteCa3Cr2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Wadalite(Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3Iso. 4 3m : I4 3d
9.AD.25HoltstamiteCa3(Al,Mn3+)2(SiO4)2(OH)4Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AD.25KerimasiteCa3Zr2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25ToturiteCa3Sn2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Momoiite(Mn2+,Ca)3V3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25EltyubyuiteCa12Fe3+10Si4O32Cl6Iso. 4 3m : I4 3d
9.AD.25HutcheoniteCa3Ti2(SiAl2)O12Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.30HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30ThoriteTh(SiO4)Tet.
9.AD.30ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30Stetindite-(Ce)Ce(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.35HuttoniteThSiO4Mon.
9.AD.35Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2xMon.
9.AD.40EulytineBi4(SiO4)3Iso. 4 3m : I4 3d
9.AD.45ReiditeZrSiO4Tet. 4/m : I41/a

Related Minerals - Dana Grouping (8th Ed.)Hide

51.5.2.1ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
51.5.2.2HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
51.5.2.3ThoriteTh(SiO4)Tet.
51.5.2.5Thorogummite(Th,U)(SiO4)1-x(OH)4xTet.
51.5.2.6Stetindite-(Ce)Ce(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.16.1UranosiliteUO3 · 7SiO2Orth.
14.16.3Soddyite(UO2)2SiO4 · 2H2OOrth.
14.16.4Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5Mon.
14.16.5WeeksiteK2(UO2)2(Si5O13) · 4H2OOrth.
14.16.6Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2OMon. 2 : P21
14.16.7NatroboltwooditeNa(UO2)(SiO3OH) · H2O
14.16.8CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2OTric. 1 : P1
14.16.9SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
14.16.10UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
14.16.11Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.
14.16.12HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OMon.
14.16.13MetahaiweeiteCa(UO2)2Si6O15 · nH2O
14.16.15SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
14.16.16EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
14.16.17KasolitePb(UO2)[SiO4] · H2OMon. 2/m : P21/b
14.16.18OrlitePb3(UO2)3(Si2O7)2 · 6H2O
14.16.19OursiniteCo(UO2)2(SiO3OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
uranium ore

References for CoffiniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Stieff L R, Stern T W, Sherwood A M (1956) Coffinite, a uranous silicate with hydroxyl substitution: a new mineral. American Mineralogist 41, 675-688

Internet Links for CoffiniteHide

Localities for CoffiniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: September 21, 2017 04:27:29 Page generated: September 15, 2017 14:23:19
Go to top of page