hand sample rounded porphorytic textured rock with fine grained matrix |
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| navigate by keyword : identification solidification mineralization amygdaloidal environment metamorphic sedimentary volcanology crystalline collecting geological geoscience unpolished mineralogy department amygdaloid keweenawan coastline collector curiosity education formation inclusion resistant vesicular vesicules petrology abrasion exemplar particle rounding sediment lapidary porphory michigan rhyolite interior superior volcanic geodesic feldspar crystals coastal fluvial geology igneous mineral science texture washing pattern rounded abraded curious olivine pockets action pebble washed design stones royale basalt quartz geodes coast earth holes holey unusual uncommon |
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| Rounded stone with white, green, rusty red, orange phenocrysts clustered together against white backdrop |
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