Fluorite & Calcite | #Geology #GeologyPage #Mineral
Locality: Jingbian, Anqing Prefecture, Anhui Province, China (Peoples Republic)
Size: 8.8 × 7.3 × 3 cm
Photo Copyright © blue mountains /e-rocks.com
Geology Page
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Triazolite | #Geology #GeologyPage #Mineral
Locality: Pabellon de Pica, Chanabaya, Iquique Province, Tarapacá Region, Chile
Size: 2.5 × 1.7 × 1.7 cm
Photo Copyright © Joy Desor Mineralanalytik /e-rocks.com
Geology Page
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The South Polar residual cap is composed of carbon dioxide ice that persists through each Martian summer. However, it is constantly changing shape.
The slopes get more direct illumination at this polar location, so they warm up and sublimate, going directly from a solid state to a gaseous state. The gas then re-condenses as frost over flat areas, building new layers as the older layers are destroyed. This animation compares a small subarea to the same locale imaged in 2009.
NASA/JPL/University of Arizona
