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While externally similar shapes, these two minerals are very different inside.
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Siderite from
Newberry Caldera, Newberry National Volcanic Monument, Deschutes County, Oregon, USA


Locality type:Caldera
Classification
Species:Siderite
Formula:FeCO3
Habit:discoidal, hemispherical, or spherical aggregates of rhombic crystals; *Towery* stacked rhombic crystal clusters occur at 1090 and 1121 m.
Colour:light to dark caramel-coloured (Fe-rich), rarely greenish, pale yellow (Mn-rich)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Siderite data
Locality Data:Click here to view Newberry Caldera, Newberry National Volcanic Monument, Deschutes County, Oregon, USA
Data Identifiers
Mindat Occurrence Record ID:859655
Long-form Identifier:1:3:859655:0
GUID (UUID V4):0
References
Bargar, Keith E. and Keith, Terry E.C. (1986) Hydrothermal Mineralization in GEO N-l Drillhole, Newberry Volcano, Oregon. United States Geological Survey Open-File Report 86-440.
Bargar, Keith E. and Keith, Terry E.C. (1999) Geothermal Drillholes at Newberry Volcano. United States Geological Survey Professional Paper 1578.
 
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