Cosmos 0 Posted May 28, 2011 Share Posted May 28, 2011 hi all, im new to the forum, i have a question hoping someone here could help me.. 3 years ago i was on a trip to Guatemala and was traveling to volcano Pacai, i found there a small lava rock that was different from evrything else there.i realy like it and was hoping to know what are the colors on the rock and how they are formed there, they only appear on one side of the rock, aldo i could find only one like that over there.. here are few pics, i have more on the on the link below, album is here : http://s294.photobucket.com/albums/mm92/Nemesysstudio/Pacai/Thank you all Link to post Share on other sites
Terry Soloman 914 Posted May 28, 2011 Share Posted May 28, 2011 That is pretty cool Cosmosis! Probably came out of one of Pacaya's epithermal vein systems. Have you tested it with a needle to see if the yellow is soft, or flakes? Looks REAL interesting! There are known gold deposits southwest of Guatamala City. Never Know I guess! Looking forward to hearing what other, more knowledgeable members have to say! Link to post Share on other sites
Johnno 64 Posted May 28, 2011 Share Posted May 28, 2011 G'Day CosmosWhen olivine Becomes dark with heat it becomes iridecsenthttp://www.scienceviews.com/islands/hawaiianrocks.htmlhttp://hvo.wr.usgs.gov/volcanowatch/2000/00_10_19.htmlCheers johnno Link to post Share on other sites
Cosmos 0 Posted May 29, 2011 Author Share Posted May 29, 2011 Hi Terry & Johnno, thanks for the replay's, yea it does look similar to few pics on the web, mine is allot more colorful but it could be it ;) , Terry i didn't try to test it in any way but the minerals are very tough and firm sitting on it.anyone esle might know something about it? for the past 3 years this rock really makes me thinking going back there to find some more. great forum by the way, i realy enjoy reading everybodys travel and finding stories. Link to post Share on other sites
GlennM 93 Posted November 25, 2011 Share Posted November 25, 2011 Find a university near you that has a geology program and set up a meeting with a professor. They love looking at different minerals/rocks and this one certainly qualifies. Link to post Share on other sites
Red_desert 138 Posted November 26, 2011 Share Posted November 26, 2011 Looks different than anything I've seen. Olivine crystals in rock can weather turning a whitish color. Some minerals containing olivine can weather into a blackish color, some diamond ores containing olivine can weather into a blackish color also. Link to post Share on other sites
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