We have two types of Markaba's, one is small and one is large.
 
Car 3-Small:
This small Markaba is approximately 49 x 49 x 49 mm, this item is a cube. Approximate weight is 210 grams. 
Car 3-Large:
This large Markaba is approximately 58.5 x 58.5 x 58.5 mm, this item is a cube. Approximate weight is 314 grams.
 
UV Sodalite or Fluorescent Sodalite was found around Lake Superior in 2017. Also, known are Syenite Sodalite. Can be found in China, Canada and USA. It has a Mohs of 6 and color is black/grey. Will react to UV 365nm light.