For a better interpretation of the genetic sequence, we need at least one overview image at a significant lower magnification, and please add a scale bar in each image.

At first glance, the Chevkinite appears as the oldest mineral, followed by amphibole as the next younger and the titanite as the youngest. The amphibole shows a brownish border zone, which is probably younger than the green amphibole. Chevkinite is included in both amphibole and titanite.

Titanite replaces amphibole. There are probably two generations of fractures: the older brittle deformation appears subparallel inside the amphibole (upper image). The younger brittle deformation cuts through all mineral generations.

Best regards,

Guenter

Hi Amjad,

I am totally agree with Guenter's interpretation.

Best wishes,

Shahrokh.

Dear Mr. Khoshhall,

I am a little bit confused too. First of all there is a rather clear statement on chevkinite and the remaining minerals titanite and amphibole s.s.s. but opaque minerals observed in the specimen are simply described as “ore”, there are some other accessory mineral phases which have been left un-identified. I can only join in the request of my colleagues to disclose some more data not only as to the size but also the geological and mineralogical setting as a whole. It is not an every-day mineral assemblage in which chevkinite takes such a position as to its temporal and spatial appearance. Is the rock slap from a pegmatite or granite? I raise the question, even if your scale bar refers to grain sizes in the range of some 100 µm.

With kind regards

H.G.Dill

Harald G. Dill thanks for your comment . The rock slap is from pegamtite. Regarding to ore phase I'm also quite sure this is also accessory phase but I need to some EMPA analyses for conformation .

Guenter Grundmann thanks for your Knowledgeable comment

Chevkinite or Biotite?!