Lord Ganesha is the bestower of Success, Intelligence, Education, Knowledge, Wisdom, Art, Talent as well as Wealth & Prosperity. Lord Ganesha is the Son of Lord Shiva & Goddess Parvati. Lord Ganesha is also known as Vighnaharta (Remover of Obstacles) and is worshipped first before any auspicious ritual or ocassion. He is ever-blissful and is devotedly worshipped by millions of people worldwide. Lord Ganesha is also known as Vignaharta, Ashtavinayaka, Ekadanta, Gajanana, Vakratunda and Ganpati. Lord Ganesha is always worshipped before starting any important work like a new Business, House construction or any other undertaking. The Auspicious recital "Om" is a manifestation of Lord Ganesha and therefore it is recited prior to any other ritualistic recitals.
While Black obsidian is associated with mystery and has a very strong ability to absorb, and hence used for protection. It is also known as a spiritual cleanser because of its ability to absorb psychic smog and help to see things more clearly.