Calymene Update Part 3

Not a lot of work since the last time.  A large section of matrix was removed along one side of the thorax.  Started using a polishing wheel on the Dremel tool to make the brown parts shiny.  Used the needle tool to clean small lines of matrix on thorax and cephalon.

Used Helicon Focus to process these images.

Fibrous or Needlelike Mineral Growth in Orthospirifer

While sorting Devonian brachiopod specimens for upcoming posts on beekite and internal coral growths I came across this oddity.  It appears to be a needlelike or fibrous mineral that grew inside the fossil. 

Looking at the list of Indiana minerals that are needlelike are: aragonite (calcium carbonate), strontianite (strontium carbonate --RARE), and geotite (iron oxide in water).  Indiana minerals that are fibrous are gypsum (calcium sulphate in water).  So I think it is either gypsum or aragonite.  Any suggestions as to what mineral this might be?

The material does not respond to long or short wave UV.

This Orthospirifer brachiopod was found in the Jeffersonville Limestone of Clark County, Indiana.

Additional photographs show specimen plus it magnified 20x with a loupe, 40x & 100x with a microscope.

Dendrites - Plant Pseudofossil?

While at the home and garden supply store picking up concrete materials, this rock was in the landscaping area.  I could not let it get torn up so I saved it from becoming part of a walkway.  Not sure where it came from or exactly what it is. The rock is in layers in a pinkish-red color with dendrite patterns through out.  On one edge is a collection of small crystals.  If the rock could be split it appears more layers have the dendrite pattern.