Mineral Specimen Images (J)

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

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

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

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

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

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

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

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

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

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

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

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