Comparison of the I and IV Diamond Types (According to Orlov’s Classification) from the Snap Lake Deposit (Slave Craton, Canada)

Diamonds of I and IV types (according to Yu.L. Orlov’s classification) from Snap Lake kimberlites were studied. Based on study of the morphology, defect–impurity profile, and internal structure of these diamonds, the “uncoated” crystals and cores of “coated” diamonds were formed under similar conditions. The coats are assumed to have appeared on a significant part of the diamonds formed under mantle conditions, and they were etched at the hypogenic stage of the kimberlite body.