Cassiterite Crystals #3 measure approximately 3/8" to 7/16" (9mm to 12mm) and weighs 1.1 to 3.0 grams). These are lovely little black crystals. Please let me pick one for you. These are $3.00 USD each.
(Healing Crystal)
Hardness: 6.0 - 7.0
Origin: Brazil
Cassiterite is grounding and protecting, of course. It will even protect you against physical danger. It can be useful to help solve problems, especially in the science disciplines. It can alleviate any feelings of rejection, disapproval, or separateness that you may experience.