Lot of Four Blue Kyanite Crystal From Brazil

This is a very nice lot of four blue Kyanite ((also known as cyanite or disthene) crystals with little bit clear quartz over from Brazil.
Location: Minas Gerais, Brazil
Weigh: each lot is about 90 Grams Combined
Average Stone Size: 6.2 x 2.2 x 1.5 Centimetre
The color, size and weight of stone may vary from lot to lot due to each piece made from natural material. The lot you receive will be similar but not identical to the photo.

Interesting Fact: Kyanite specimens have a variable hardness. The long crystals have a Mohs hardness of about 4.5 to 5 if tested parallel to the length of a crystal, and a hardness of 6.5 to 7 if tested across the short dimension of a crystal. The mineral was once commonly called "disthene" which means "two strengths."