Marmot
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More precisely, it's a grayish-brownish-purple hue. I read about it in a book when I was a child. Now I tried to find out its origin, but I couldn't, although the expression is quite popular and has been around for a long time.
Воскресайте, камінні душі, Розчиняйте серця і чоло, Щоб не сказали Про вас грядущі: їх на землі не було…
(Василь Симоненко. Люди – прекрасні)
(Василь Симоненко. Люди – прекрасні)