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PhotosEsperite - Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA

20th Nov 2015 17:30 UTCRichard Gunter Expert

Has there been any progress since 1995 on Dunn's unnamed phase that occurs as a reaction between the Esperite and Hardystonite in this paragenesis? The boundary between the two phases on this sample has a rim of < 1 mm reddish-pink slightly elongate prisms. The fractures in the Esperite are opaque white and do not fluoresce. This may be his other unnamed phase?

20th Nov 2015 17:51 UTCReiner Mielke Expert

You are going to have to post a better picture than that, can't make anything out. Try lightening it up. Some arrows pointing to the things you are asking about would help as well.

20th Nov 2015 18:11 UTCRichard Gunter Expert

Hi Reiner:

I will try to post a better set of pictures with arrows. I was inquiring about the state of the literature as Dunn left these two phases unnamed in his article on the lead silicates. I did not know if they were still unnamed or whether someone had done more work since 1995.

20th Nov 2015 22:10 UTCRichard Gunter Expert

Hi Reiner:

This photo is as close as my camera can get. The one unnamed mineral appears to be the reddish crystals dead center of the photograph between the Esperite on the right and the Hardystonite on the left of the photograph. I know they are small but they line the whole of the boundary between the two phases. The other unnamed phase appears to be the opaque edges of the Esperite grains. The SW UV on this sample looks like a checkerboard as the opaque edges of the Esperite grains do not fluoresce in either SW or LW.