Its epidote so it must be green, yeah?
Mineral Matters #764
Well, yes, usually that is the case. But like most minerals, there can be a range of tones, if not colours.
When you look down on the tops of the sprays on this specimen, the mineral looks brown. But when you see a cross-section, you can see a range of colours, from very pale grey at the base to yellowish through green to brown. It has been suggested as cerium-bearing, possibly a mixture with allanite.
Interesting stuff!
Below: Epidote, Petersberg Quarry, Petersberg, Saalekreis, Saxony-Anhalt, Germany. Width of view 6mm. Click on the image for a higher resolution version.
Makes a difference from ‘pistachio’ green, again, again!
There's more happiness in lumping than in splitting. At least it's more affordable.