Mineral Specimen Images (J)

Jinshajiangite: Na2K5BaCa(Fe,Mn)8(Ti,Fe,Nb,Zr)4Si8O32(O,F,H2O)6

Comments: Reddish elongated junshajiangite grain to 0.3mm in matrix.
Location: Norra Karr, Sweden. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Jixianite: Pb(W,Fe+++)2(O,OH)7  
Cuprotungstite: Cu++3(WO4)2(OH)2

Comments: Reddish brown crystal druse of jixianite with minor tan cuprotungstite.
Location: Apache Mine, Hidalgo County, New Mexico, USA. Scale: See Image.
© Jeff Weissman / Photographic Guide to Mineral Species

Joaquinite-(Ce): NaFe++Ba2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)·(H2O)

Comments: Brown crystal of joaquinite-(Ce).
Location: Benitoite Gem mine, San Benito County, California, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Joelbruggerite: Pb3Zn3Sb+++++As2O13(OH)  
Mimetite: Pb5(AsO4)3Cl

Comments: SEM image of a barrel-shaped joëlbruggerite crystal lanced by acicular mimetite. (AmMin, v94:1012).
Location: Black Pine mine, 14.5 km northwest of Philipsburg, Granite County, Montana, USA. Scale: Crystal Size 30 µm across.
© American Mineralogist

Johachidolite: CaAlB3O7

Comments: 0.91 carat round cut johachidolite gem.
Location: Byant Gyi, Pein Pyit, Mogok, Burma (Myanmar). Scale: Not Given.
© Adam Larson

Johachidolite: CaAlB3O7

Comments: Yellowish orange crystal of johachidolite on matix (quartz, muscovite).
Location: Pein Pyit, Mogok, Mandalay Myanmar. Scale: Crystal Size: 1.2 × 0.7 cm.
© Fabre Minerals

Johannite: Cu(UO2)2(SO4)2(OH)2·8(H2O)

Comments: Green colored johannite crystals.
Location: Happy Jack mine, White Canyon, San Juan County, Utah, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Johannite: Cu(UO2)2(SO4)2(OH)2·8(H2O)  
Uranopilite: [(UO2)6(SO4)O2(OH)6(H2O)6]·8(H2O)

Comments: Bright yellow rosettes of uranopilite with pale greenish yellow johannite on matrix.
Location: Apex Mine, Lander Co., Nevada, USA. Scale: Picture size 0.5 cm.
© Paul M. Schumacher

Johannite: Cu(UO2)2(SO4)2(OH)2·8(H2O)  
Uranopilite: [(UO2)6(SO4)O2(OH)6(H2O)6]·8(H2O)

Comments: Green aggregates of minute, acicular johannite and yellow uranopilite and clear, tabular aragonite crystals on matrix.
Location: Apex Mine, Lander Co., Nevada, USA. Scale: Picture size 1.5 cm.
© Paul M. Schumacher

Johannsenite: CaMnSi2O6

Comments: Mass of prismatic bluish green colored johannsenite crystals.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 7.2 x 4 cm.
© John Veevaert

Johannsenite: CaMnSi2O6

Comments: Rounded glassy prismatic crystals of dark violet brown johannsenite to 1.4 cm. Long.
Location: Consols Mine, Broken Hill, NSW, Australia. Scale: 1.5x1.5x1 cm.
© Richard Dale / Dale Minerals

Johillerite: Na(Mg,Zn)3Cu(AsO4)3

Comments: Violet-blue grains of johillerite on matrix.
Location: Tolbachik Volcano, Kamchatka, Russia. Scale: Specimen Size 0.5x1 cm.
© Diederik Visser

Johnbaumite: Ca5(AsO4)3(OH)  
Tephroite: Mn2SiO4

Comments: Violet crystalline massive johnbaumite with brown tephroite.
Location: Jacobsberg, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Johninnesite: Na2Mg4Mn++12(AsO4)2(Si12O35)(OH)6

Comments: Orange crystalline vein of johninnesite in manganese oxide matrix.
Location: Ausserferrera, Val Ferrera, Graubundun, Switzerland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Johnsenite-(Ce): Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2  
Macfallite: Ca2(Mn+++,Al)3(SiO4)(Si2O7)(OH)3  
Braunite-I: Mn++Mn+++6SiO12

Comments: Tiny - less than 1mm - maroon crystals of mcfallite suspended as inclusions in massive quartz along with larger spots of brown johnsenite-(Ce) and braunite.
Location: Artur mine, Jaguaracu, Minas Gerais, Brazil. Scale: Overall 3 x 2.5 slab.
© Tom Loomis / Dakota Matrix

Johnsomervilleite: Na2Ca(Mg,Fe++,Mn)7(PO4)6

Comments: Dark brownish johnsomervilleite.
Location: Sapucaia Mine, Conselheiro Pena district, Galiléia, Governador Valadares, Rio Doce, Minas Gerais, Southeast Region, Brazil. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Johnwalkite: K(Mn++,Fe+++,Fe++)2(Nb,Ta)(PO4)2O2((H2O),OH)2

Comments: Fragment of translucent johnwalkite.
Location: Champion Mine, Keystone District, Pennington Co., South Dakota, USA. Scale: Crystal length 1 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Jokokuite: MnSO4·5(H2O)

Comments: Pale pink stalactic mass of jokokuite.
Location: Jokoku Mine, Haminokuni, Hokkaido, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Jolliffeite: (Ni,Co)AsSe  
Eskebornite: CuFeSe2

Comments: Back-scattered electron image of jolliffeite in sulfurian eskebornite. Note the cracked appearance and the different brightness of eskebornite, which is a reflection of variable ratio of selenium to sulfur. (CanMin v 42, p 844).
Location: Niederschlema-Alberoda uranium deposit, in the Erzgebirge region of Germany. Scale: See Image.
© Canadian Mineralogist

Jonassonite: Au(Bi,Pb)5S4

Comments: PPL (a) and XPL (b) of jonassonite (Jo) with inclusions of native bismuth (Bi) is intergrown with native bismuth (Bi) and bismuthinite (Bmt). (b) demonstrates the characteristic orange-red color of jonassonite. (CanMin, v44:1127).
Location: Nagybörzsöny ore deposit, Börzsöny Mountains, Hungary. Scale: Scale bar 100 µm.
© Canadian Mineralogist