Afghanite, Calcite, Phlogopite, Marialite, w/ a Midwave Kicker - Afghanistan

This piece (as most from Afghanistan) is best displayed using multiple wavelengths. This piece shows best under a combination of longwave, midwave and shortwave (fullwave), although it is very respectable under SW alone (second pic). Lots of pics below the main pic.

While there are numerous afghanite crystals it seems that the matrix is massive afghanite, or maybe some other mineral. The white light color is blue but under SW it really comes alive. Appears to be a mix of massive phlogopite, marialite, a white fluorescing mineral and maybe more.

Under SW the calcite fluoresces a dark orange, and unknown crystals fluoresce a bluish white - my guess is that the white is albite. Under MW (only) there are areas of a strong blue fluorescence from an unknown mineral - this is one of the few examples of MW only fluorescence I have observed.

Midwave causes the calcite to pop very nicely. Longwave brings out the orange color of the afghanite crystals. MW and LW bring out the bright yellow of the marialite very nicely. If I were to display it under only one light, I would probably pick SW, preferably with a LW “kicker”.

The closeups below show various interesting areas. Note that the phlogopite on this piece is fluorescent a bright yellow SW and a butterscotch under MW. Click any thumbnail for larger pics.

A note about the blue stuff:

Most of the blue minerals from Badakshan are members of the Cancrinite Sodalite Group. These include the following:

All of these minerals are often misidentified and confused with each other. The absence of calcium and chlorine (or the presence) is often the only characteristic separating nosean from hauyne for example; in massive form (no crystals) there is little visible difference. Lazurite has more sulfide while hauyne has more sulfate. Minrec reports that most lazurite is really sulfide-rich hauyne. I’m pretty sure much of the massive material also has afghanite thrown in for good measure. So - if there are no crystals to help in the identification, the massive blue mineral could be many things. Worse, the fluorescent activators have not been studied from this area and it’s very unclear what is going on. But they sure do make for some confusing but beautiful fluorescent specimens.

The animations show various closeups.

Email comments or suggestions:

Home

Nature’s Rainbows is a non-commercial web site maintained entirely by volunteer hobbyists and contributors.  Our mission is to provide information about UV and luminescence, premium fluorescent mineral photos, and a fluorescent mineral database for the enjoyment of FL mineral collectors around the world.  Information on this web site is covered under a Creative Commons License.


Feel free to contact us with comments and suggestions.

Like us on Facebook!

  • reddit
  • Facebook Social Icon

Subscribe to our RSS (Real Simple Syndication) feed to get new posts delivered directly to your desktop!