Ontario introduced time-of-use (TOU) pricing to reflect the costs of producing electricity at different times of the day. There are three TOU periods: 1  Off-peak, when energy demand is low and less expensive sources of electricity is used. 2  Mid-peak, when the cost of energy and demand are moderate. 3  On-peak, when demand is highest and more expensive forms of electricity production are used.
Sheen Obsidian-this is a family of valued types which consists of sub-types categorized according to the effect or color displayed. Microscopic bubbles and/or crystals of Feldspar or Mica trapped in the Obsidian result in a chatoyant (irridescent) sheen when the stone is viewed from certain angles.heen Obsidian-this is a family of valued types which consists of sub-types categorized according to the effect or color displayed. Microscopic bubbles and/or crystals of Feldspar or Mica trapped in the Obsidian result in a chatoyant (irridescent) sheen when the stone is viewed from certain angles.
The types of stones that may be used for beads and inlays are nearly countless, but some appear in Native American jewelry more than others. Navajo, Zuni and Santo Domingo Indian jewelry exhibits the most variety of fine gemstones.The most common stones include:1  Coral. 2  Spiny oyster. 3  Lapis.4  Jasper. 5  Mother of pearl.ommon Gemstones in Beaded and Sterling Silver Jewelry. The types of stones that may be used for beads and inlays are nearly countless, but some appear in Native American jewelry more than others. Navajo, Zuni and Santo Domingo Indian jewelry exhibits the most variety of fine gemstones. The most common stones include: