Manganvesuvianite, Ca19Mn(Al,Mn,Fe)19(Mg,Mn)2Si18O69(OH)9
Locality: South Africa
Manganvesuvianite, Ca19Mn(Al,Mn,Fe)19(Mg,Mn)2Si18O69(OH)9
Locality: South Africa
“Cavers light the entrance passage of Ora Cave.”
Photograph by Stephen Alvarez
“Cavers light the entrance passage of Ora Cave.”
Photograph by Stephen Alvarez
Cacoxenite, Fe3+24Al(PO4)17 O6(OH)12 . 17H2O
Locality: France
Cacoxenite, Fe3+24Al(PO4)17 O6(OH)12 . 17H2O
Locality: France
“A mountaineer on the summit ridge of 4650-meter Mount Shinn.”
Photograph by Gordon Wiltsie
“A mountaineer on the summit ridge of 4650-meter Mount Shinn.”
Photograph by Gordon Wiltsie
Rhodochrosite, MnCO3, and Quartz, SiO2
Locality: Colorado, USA
Rhodochrosite, MnCO3, and Quartz, SiO2
Locality: Colorado, USA
“Two scientists next to lava and sparks spewing from Mount Etna.”
Photograph by Carsten Peter
“Two scientists next to lava and sparks spewing from Mount Etna.”
Photograph by Carsten Peter
Hematite, Fe2O3, and Opal, SiO2 . nH2O
Locality: Spain
Hematite, Fe2O3, and Opal, SiO2 . nH2O
Locality: Spain
Limestone nodule
Locality: Alenquer, Portugal
