A dusting of goethite on some of the chabazite rhombs. A small stacked stilbite is nestled amongst the chabazite (centre of photo). Ex Jo Price Collection. Width of view 5.75mm. Stack of 40 images (stilbite)...
Tiny pyrite crystals part altered to goethite on calcite. There are two generations of calcite. The earlier one fluoresces red, and the later fluoresces white. There is a sharp delineation between the two. Ex Jo...
Pink twinned rhombohedral chabazite with colourless analcime. Tiny green spots of saponite (towards the bottom left for example) and biotite phenocrysts (not in photo) also present. Some of the chabazites exhibit an unusual stack-like habit...
Quartz pseudomorph after barite. Ex Brother Juan Salvador, FMS, a volunteer at the AMNH in the 1880s. His card apparently read One of the great treasures of my collection, 16/7/1884. Ex American Museum of Natural...
