This is a lot of two specimens. The dimensions given are for the first specimen (pseudomrophs after donnayite group). The second specimen (parisite-(Ce)/synchysite-(Ce )) is 2.5 x 3.5 x 2.0 cm and weighs ca 15 g.
The first specimen is a large micro with small crystals/aggregates of a donnayite group mineral (replaced by "mush") on quartz and corroded microcline with minor siderite and tiny pyrite cubes. It was not possible to assign any specific species to the "mush" via EDS.
The “donnayite” in the foreground of the next pair of photos is 2.7 mm tall. You will need 10-15X to view it.
The second pair of "donnayite" photos shows a few more "crystals", the largest about 2.6 mm tall. There are a few other, smaller, or partial, "crystals" on the specimen.
The parisite/synchysite on the second specimen is from an analyzed find – see the “Analysis” tab. According to the qualitative EDS, the tiny white flakes/discs are intermediate in composition between parisite-(Ce) and synchysite-(Ce). These two minerals sometimes form syntactic intergrowths at MSH, which is probably the case here. (See the 1990 Min Rec special article on MSH.) In any case, parisite-(Ce) is rare at MSH and this is a fairly rich example.
The first pair of parisite/synchysite photos (FOV 2.4 x 3.4 mm) is a close-up of one small section densely covered by the parisite/synchysite. The little “saucers” are <= 0.15 mm in diameter. You will need 40-60X to see them as in the photos. The longest edge on the pyrite crystal is 1.2 mm. The black prism is aegirine.
The next pair of photos (FOV 6.8 x 4.3 mm) is a broader view of the same area and shows a couple more pyrite crystals. There is more parisite/synchysite on other parts of the specimen plus fragments of cavernous gray pseudomorphs that may also be parisite/synchysite, but these were not analyzed. They are nothing special – it is very common to see such at MSH.
The next photo (FOV 10 x 8.7 mm) shows most, but not all, of the parisite/synchysite on the specimen.
I have not provided a full view of the parisite speciemen. It doesn't look like anything when hand-held.
The combined shipping weight (no cases) is 3.8 oz. Outside the USA, the stated postage and packing rate applies up to a total weight of 8 oz (225 g).
Within the USA, there is a nominal increase of $0.20 for each additional ounce. Above 13 oz, I will use Priority Mail. Up to 16 oz, the “own box” Priority rate is $9.25 (including packing).
