All natural mine rough sphene,sometimes called titanite due to the titanium content,with a 5 1/2 mohs hardness,in 1/2 ounce,,,about 15 grams,75 carat,,,lots scooped from material as pictured (one picture was taken wet with back light and the other just dry and no back light).Green/yellow green with some orange and reds in color and sized at approximately 4-20 MM in length and width by 4 to 10 mm deep,,,,about 1/8 inch to 1 1/4 inch,,,and as this is mine rough material,some matrix,,or host rock,,may still be attatched to the sphene crystal but we will do our best to adjust the weight accordingly.1/2 ounce lots will contain from 5 to 12 pieces due to the variation in size of individual pieces and if you have a preference as to size we will do our best to accomodate.This material comes from  Baja Mexico and is quite rare ans as to facetability i have seen some great fire display from 4 and 5 mm stones faceted from this material.Shipping in the US mainland will be FREE by USPS first class,all other shipping locations worldwide, where allowed by law,will be $33.99 USPS priority.