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2. Fire agate - Wikipedia

   en.wikipedia.org/wiki/Fire_agate

   Fire agate, a variety of chalcedony, is a semi-precious natural gemstone discovered so far only in certain areas of central and northern Mexico and the southwestern United States (New Mexico, Arizona and California). [1] Approximately 24-36 million years ago these areas were subjected to massive volcanic activity during the Tertiary Period.

3. Fire pit - Wikipedia

   en.wikipedia.org/wiki/Fire_pit

   When a fire is to be built somewhere such as on a patio or in a backyard, a fire pit or outdoor fireplace may be better used instead. These are designed to contain the entire fire instead of just keeping it in one place. [citation needed] A tipi fire in a stone fire ring. A fire ring may be nothing more than a short, wide section of metal tube ...

4. Campfire - Wikipedia

   en.wikipedia.org/wiki/Campfire

   A ring of rocks is sometimes constructed around a fire. Fire rings, however, do not fully protect material on the ground from catching fire. Flying embers are still a threat, and the fire ring may become hot enough to ignite material in contact with it, or the heat the water to a vapor thereby cracking the rocks. [4]

5. Luminous gemstones - Wikipedia

   en.wikipedia.org/wiki/Luminous_gemstones

   The OED defines pyrope (from Greek Πυρωπός, lit. "fire-eyed")" as: "In early use applied vaguely to a red or fiery gem, as ruby or carbuncle; (mineralogy) the Bohemian garnet or fire-garnet"; and carbuncle or carbuncle-stone (from Latin "carbunculus", "small glowing ember") as: "A name variously applied to precious stones of a red or ...

6. Tiger's eye - Wikipedia

   en.wikipedia.org/wiki/Tiger's_eye

   Tiger's eye (also called tiger eye) is a chatoyant gemstone that is usually a metamorphic rock with a golden to red-brown colour and a silky lustre.As members of the quartz group, tiger's eye and the related blue-coloured mineral hawk's eye gain their silky, lustrous appearance from the parallel intergrowth of quartz crystals and altered amphibole fibres that have mostly turned into limonite.

7. Tipi ring - Wikipedia

   en.wikipedia.org/wiki/Tipi_ring

   The rings of stone held down the edges of animal skin hides of the cone-shaped tipis, to keep them snug against the ground. The general pattern of a tipi (also "tepee") ring is an east-facing entrance, where there are no stones, and a heavily anchored side with extra stones for protection against prevailing winds, often on the northwestern side ...