fossils in limestone and quartz - id?

[Ramona]

Here I am again, with questions on another rock!  I can recognize more and more fossils and rocks, but I love finding things I don't recognize.  :-)  This limestone rock, found in Huntsville, AL, as a portion that has a lot of quartz in it, and a lot of tunnels and crevices.  I recognize the crinoid fossils but am not sure about some of the other ones.  I have put questions marks on the areas I am wondering about, and asked a question in one image.   It also almost looks like there are areas where geods were trying to form, but that may just be due to all of the quartz.

Help appreciated! 

Thanks!
Ramona

[Fossildude19]

Not sure your sparkles are quartz. 

I would think more likely it is silica or calcite. 

 

The only other recognizable fossils I can see are bryozoans.  

 

@ynot

[Ramona]

2 minutes ago, Fossildude19 said:

Not sure your sparkles are quartz. 

I would think more likely it is silica or calcite. 

 

The only other recognizable fossils I can see are bryozoans.  

 

@ynot

That is certainly a possibility.  So, everything that sparkles is not quartz?  ;-)  

Ramona

[ynot]

I agree with calcite being more likely for Your "sparkles".

many crystals will have shiny faces and make a sparkly surface when there are a bunch of small ones in an area.

[Coco]

Hi,

 

To differentiate between a quartz and calcite crystal, put a little white vinegar on a slightly visible side of the crystals. If it makes bubbles, it’s calcite.

 

Coco