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.
Obsidian Rock. Obsidian rock is actually a type of glass that formed when molten lava cooled so quickly, there was not time for any crystals to form. The actual composition of the rock is dependent on what minerals, gases, and such were in the immediate area when the lava cooled.bsidian stone can be found almost anywhere there has been volcanic activity in the past, but not all the sources are currently being mined. Most mining is done in Armenia, Greece, Hungary, Iceland, Italy, Japan, Java, Kenya, Mexico, New Zealand, Scotland and Turkey.