Underwater landscapeResembling the rising towers in some underwater cave city in a science fiction m
Underwater landscapeResembling the rising towers in some underwater cave city in a science fiction movie, hollow inclusions in a translucent light blue agate from Brazil rise out of an older layer of agate into the younger core. Geodes remember tend to fill the cavities (usually vesicles in lavas) from the outside in, some only forming crusts of quartz like the many examples from the Parana flood basalts in Uruguay, others get completely filled, often by several generations of growth from different pulses of fluids. These will contain different proportions of dissolved elements, forming the various colours in the agate. The red alga like fronds are iron oxide inclusions, probably haematite, while the yellow are either limonite or goethite, other iron oxides.LozImage credit: agateswithinclusions.com -- source link
#agate#brazil#science#geode#nature#mineral#minerals#quartz