Occurrence and Composition
Tremolite in a Marble
This sample is a marble from the Adirondack
Mountains, New York. Almost all of the field of view (about 2
mm across) is tremolite. The large grain in the center (viewed
nearly down the c-axis) shows the classic amphibole cross section
and cleavage. Smaller grains around
it have their long axes in the plane of the thin section and
so appear as long bladey crystals.
Talc in a Serpentenite (Verde Antique)
This is a talc-tremolite
schist from the same location as the previous photos. The tremolite
is clear in PP light and has 2nd order interference
colors in the XP view. The talc, which
has a dingy green color in the PP view,
shows extremely high order interference
colors -- almost "pearl white" in the XP view.
The field of view of these photos is about 2.5 mm. This thin
section was poorly made. Many small bubbles
were trapped in the epoxy when it was prepared. They appear as
small round circles in these pictures.