Biotite Black 4mm Round - 15-16 Inch 10x12-12x16mm and it can be mottled
Description
and it can be mottled or striated with veins of these colors
is a calcium aluminium hydroxy sorosilicate belonging to the epidote group of minerals
It was named from the Latin "Thule" - which was a term used by ancient Greeks and Romans to refer to the then-little-known lands to the north or present day Scandinavia
commonly known as Limestone
This effect is known as “labradorescence
Biotite Black 4mm Round - 15-16 Inch 10x12-12x16mm and it can be mottled
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