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sea glass
Sea glass and beach glass are similar but come from two different types of water. "Sea glass" is physically and chemically weathered glass found on beaches along bodies of salt water. These weathering processes produce natural frosted glass. "Genuine sea glass" can be collected as a hobby and can be used to make jewelry. "Beach glass" comes from fresh water and in most cases has a different pH balance, and has a less frosted appearance than sea glass. Sea glass takes 20 to 30 years, and sometimes as much as 50 years, to acquire its characteristic texture and shape.〔Sea Glass Journal (date unknown). The Godfather of Sea Glass: Richard LaMotte Boosts the National Profile of Sea Glass Retrieved from http://www.seaglassjournal.com/articles/pureseaglass/lamotte.htm on 2/19/2015.〕
==Formation==
Sea glass begins as normal shards of broken glass that are then persistently tumbled and ground until the sharp edges are smoothed and rounded. In this process, the glass loses its slick surface but gains a frosted appearance over many years.〔Author unknown (date unknown). What is Sea Glass? Retrieved from http://www.findseaglass.net/what-is-sea-glass/.〕
Naturally produced sea glass ("genuine sea glass") originates as pieces of glass from broken bottles, broken tableware, or even shipwrecks, which are rolled and tumbled in the ocean for years until all of their edges are rounded off, and the slickness of the glass has been worn to a frosted appearance.
Artificially produced sea glass (sometimes called "beach glass"), although superficially similar to sea glass in appearance, nevertheless has clear differences in appearance. Having not actually originated from the sea, most connoisseurs will not consider artificial "sea" glass to actually be genuine sea glass, but rather simply tumbled glass, where pieces of modern-day glass are tossed into a rock tumbler or dipped in acid to produce the desired finish. Artificially-produced, the glass is much less expensive and is used for making jewelry, but is often passed off as real sea glass.〔North American Sea Glass Association (date unknown). NASGA Resources: Genuine vs. Artificial Sea Glass Retrieved from http://www.seaglassassociation.org/RealVArtificial.html on 2/19/2015.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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