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What is this red glassy rock?
  
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Ericnilla




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PostPosted: Oct 01, 2019 18:36    Post subject: What is this red glassy rock?  

My dad found this rock recently and wanted to know what it was but never got around to checking it out. It was found in southern California, and has a glassy texture similar to obsidian (There is lots of obsidian found in our area). It has some interesting striations or stripes in certain areas going from red to clear.


20191001_145531.jpg
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Riverside County, California, USA
 Dimensions: 11cm
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20191001_145531.jpg


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Ericnilla




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PostPosted: Oct 01, 2019 18:39    Post subject: Re: What is this red glassy rock?  

Another view


20191001_145738.jpg
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John S. White
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PostPosted: Oct 01, 2019 19:11    Post subject: Re: What is this red glassy rock?  

Man made furnace glass.
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Bob Harman




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PostPosted: Oct 01, 2019 19:12    Post subject: Re: What is this red glassy rock?  

Agree with JOHN, glass, man made. BOB
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Ericnilla




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PostPosted: Oct 01, 2019 20:11    Post subject: Re: What is this red glassy rock?  

Interesting, thank you so much!
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Dale Hallmark




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PostPosted: Oct 02, 2019 15:15    Post subject: Re: What is this red glassy rock?  

A lot of this is sold as aquarium decorations. simple decor and many other purposes too..

Dale
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vic rzonca




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PostPosted: Oct 02, 2019 17:35    Post subject: Re: What is this red glassy rock?  

Selenium, like manganese, can be used in small concentrations to decolorize glass, or in higher concentrations to impart a reddish color, caused by selenium nanoparticles dispersed in glass. It is a very important agent to make pink and red glass. When used together with cadmium sulfide, it yields a brilliant red color known as "Selenium Ruby".
Pure metallic copper produces a very dark red, opaque glass, which is sometimes used as a substitute for gold in the production of ruby-colored glass.
Metallic gold, in very small concentrations (around 0.001%, or 10 ppm), produces a rich ruby-colored glass ("Ruby Gold" or "Rubino Oro"), while lower concentrations produces a less intense red, often marketed as "cranberry". The color is caused by the size and dispersion of gold particles. Ruby gold glass is usually made of lead glass with added tin.
Silver compounds such as silver nitrate and silver halides can produce a range of colors from orange-red to yellow. The way the glass is heated and cooled can significantly affect the colors produced by these compounds. Also photochromic lenses and photosensitive glass are based on silver.
Of the many silica-based glasses that exist, ordinary glazing and container glass is formed from a specific type called soda-lime glass, composed of approximately 75% silicon dioxide (SiO2), sodium oxide (Na2O) from sodium carbonate (Na2CO3), calcium oxide (CaO), also called lime, and several minor additives.
Gleaned from the interweb.
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