Large 5.8" Black Obsidian Egg/Sphere Crystal Mineral Stand Polished Gemstone Plate w/Star of David Decoration You will get one of the Black Obsidian Stand similar to the one in the listing, the size and the color of the stand may slightly vary as well due to the fact that all minerals are different. (Spheres not included). Approcimatly stands size: 147mm x 15mm / 5 13/16 x 5/8 Inches; 585g / 20.6oz. Obsidian is a natural form of volcanic glass , composed of various combinations of basalt, Andesite, Rhyolite, and Trachyte. Basic colours range from smoky gray to red or reddish brown, blue and black. Obsidian comes in a number of colours and patterns including banded, snowflake (small white bursts resembling snowflakes), mahogany (includes streaks of mahogany coloured bands), rainbow or peacock (contains layers of iridescent colours) and sheen (colours such as gold, silver or blue sheen seen in certain lights) Obsidian also occurs in small nodules known as Apache Tears. Obsidian was so named from its resemblance to a stone found in Ethiopia by Obsius. Rainbow Obsidian is black obsidian that, when polished and exposed to a strong light, shows bands of rainbow colors. Rainbow obsidian is said to be the stone used by Nostradamus to foresee future events. Obsidian is formed when volcanic lava cools very quickly. Hardness: 6-Hardness; Color: Black. (The above information is provided solely for informational purpose. Kindly note that all stones are offered for decorative purposes only. Please, handle your stones with great care, do not grind or crumble them, do not dip or add them into your food or drink, do not use any parts of them in any elixirs, potions, lotions etc. Always make sure you wash your hands before and after working with your crystals.)