I am sending this off for testing but until then I thought it would be fun to hear some of your best guesses on this one.
The location is Packsaddle Mountain, Llano Uplift in central Texas.
This specimen is on a green schist(make-up of the schist includes-albite, tourmaline, tremolite,calcite, quartz).
Very nearby(within a few cm) dravite(with Ti), garnet, epidot,k-feldspar,mica.
This deposit sits below an iron cap to include closeby- goethite, jarosite, galena, many Mn...
The specimen-
hardness and streak-too small to test
dissolves readily in HCI(no bubbles)
orthorhombic
does not dissolve in water
the FOV is 2mm
ans the second is FOV .5