6:46

Mineral Luster

16:03

Minerals with Willsey: Calcite

24:19

Minerals with Willsey: Feldspars

17:04

Hardness Testing Rocks // Using the Moh's Hardness Test Kit

10:07

Mineral Habit

27:59

Rock Identification with Willsey: Sandstone, Mudstone, and Shale

9:19

Mineral Groups

20:14

$6000 investment - The best cut ever - Rare Harlequin Black Opal