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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



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



“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



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



“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



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



“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



Hematite, Fe2O3, and Opal, SiO2 . nH2O

Locality: Spain

Hematite, Fe2O3, and Opal, SiO2 . nH2O

Locality: Spain



Limestone nodule
Locality: Alenquer, Portugal

Limestone nodule

Locality: Alenquer, Portugal




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