Tom Santiago 0 Posted September 20, 2012 Share Posted September 20, 2012 I found it in Rio de janeiro Brazil. We buy a lot of kinds of soil. Sand, mud, etc. For landfilling and make raised beds to cultivated food.And i found in my garden this rock. Quote Link to post Share on other sites
Tom Santiago 0 Posted September 20, 2012 Author Share Posted September 20, 2012 the last one is reflecting the banana tree, so gets green in a part.Sorry for my english, im bad in writing...But still wanna know what is this rock! Quote Link to post Share on other sites
rockhunter1620 62 Posted September 21, 2012 Share Posted September 21, 2012 Without other info bout surounding ground and some othether info, looks like clear crystaline quartz or flouririte, some details about where it was found, details concerning it's surounding country rock and groundmass would help, but it loooks like a clear quartz to me....RH Quote Link to post Share on other sites
Tom Santiago 0 Posted September 21, 2012 Author Share Posted September 21, 2012 i cut a piece of glass, the glass dont scratch the rock. I found in my garden, i dunno if comes with sand from river, or fall from the sky, or came from mud, we call here tabatinga.thxn rock hunter!! Quote Link to post Share on other sites
Tom Santiago 0 Posted September 21, 2012 Author Share Posted September 21, 2012 its cristaline! some here tells me that its a diamond, rsrsrsrsfor the shiny light and refraction...but i duunmo too!Other says a Opal, Citrine and Qartz Quote Link to post Share on other sites
Tom Santiago 0 Posted September 21, 2012 Author Share Posted September 21, 2012 there more photos in my album Quote Link to post Share on other sites
bigrex 60 Posted September 21, 2012 Share Posted September 21, 2012 Looking at the general shape and conchoidal fractures, most likely quartz. Brazil is the quartz capital of the world I would say, especially Minas Gerais. Quote Link to post Share on other sites
mihailovici179 3 Posted September 21, 2012 Share Posted September 21, 2012 Hello Tom. You must calculate specific gravity and hardness of your rock, and than may be we will can help you. May be glass, tektite or quartz idk.Best regards Mihail Quote Link to post Share on other sites
adam 3,127 Posted September 21, 2012 Share Posted September 21, 2012 Heres some glassy quartz I dug from an outcrop in Quartzsite. Dont know if it helps any..... Quote Link to post Share on other sites
Tom Santiago 0 Posted September 21, 2012 Author Share Posted September 21, 2012 There some method to calculate this specific gravity and hardness? Its the weight? 40g - 200 cts | Or i have to go to a specialist to make tests?I risk this rock with steel blade and dont mark, but with the diamond cutter (glass cutter pen) its mark.I risk glass with the rock.up to 7 in the hardness scaleAnd its a little diferent from this glassy quartz, my rock is more clear, you can see through, ill try to take more photos! and put here! Thxn people for help me!! We´ll Keep trying! Im searching a good and not very expensive $$ lab to make tests with the rock, Quote Link to post Share on other sites
mihailovici179 3 Posted September 22, 2012 Share Posted September 22, 2012 You must weigh your rock (the G value), then weigh the rock in a glass of water (after you've done Tarra) and then you know the value of Ga. So, you find specific gravity SG. Like in example:http://2.bp.blogspot.com/-SL4R1oqm50k/UF4F1mBWA3I/AAAAAAAAEPk/D3nBzr9GJoI/s1600/SG.bmp So SG = 5g/cm3Best regardsMihail Quote Link to post Share on other sites
Tom Santiago 0 Posted September 22, 2012 Author Share Posted September 22, 2012 K!! Thnx!! G= 40gGa = 15gSG = 2.6g/cm3 Quote Link to post Share on other sites
mihailovici179 3 Posted September 22, 2012 Share Posted September 22, 2012 Now, if you know hardness of your sample and if it react or not with acid (vinegar) you can easily find what is it.These will help you:http://www.reade.com/Particle_Briefings/spec_gra2.htmlhttp://www.webmineral.com/determin.shtml#.UF43ObLibNo Quote Link to post Share on other sites
Tom Santiago 0 Posted September 23, 2012 Author Share Posted September 23, 2012 Dont react with vinegar. but seems its more clean now... i can see some inclusions that i cannot see before..Its most hard then steel blade. Specific gravity = 2.6g/cm3Hardness = 7 +- or more.Strake = incolornot fluorescent.Rock Crystal / Qartz crystal / ....i dunno...i ll try fisio-quimio analisis.=)) thx for help!!Ill post later my collection of rock, from a lot of countries. Quote Link to post Share on other sites
oredigger62 17 Posted September 23, 2012 Share Posted September 23, 2012 Quote Link to post Share on other sites
El Dorado 964 Posted September 23, 2012 Share Posted September 23, 2012 TomI tried to answer your email, but each time I replied it would not go through to you. But either way I would be no more help than others here..... Quote Link to post Share on other sites
Tom Santiago 0 Posted September 23, 2012 Author Share Posted September 23, 2012 Hey Orediger62 / Lewis, this rock is a nice piece!!Seems like cousin of mine! =)What is it?? Quote Link to post Share on other sites
oredigger62 17 Posted September 23, 2012 Share Posted September 23, 2012 Hey Tom , I found this more than a mile from the nearest road ... all covered in dirt so in my pack it went. Everybody here knows what it is.... at least anybody over 40 that is. It is a piece of very thick tempered glass from an old insulator. But you are right Tom it did look just like yours. and my chunk weighs 46 grams Quote Link to post Share on other sites
Tom Santiago 0 Posted September 23, 2012 Author Share Posted September 23, 2012 this piece is cold?my rock is very cold!! Quote Link to post Share on other sites
oredigger62 17 Posted September 24, 2012 Share Posted September 24, 2012 Tom , I sure hope yours is indeed something very special. I thought it was strange how similar my chunk was... they sure did look alike. Mine is cold because tempered glass is not a good object to absorb heat from light instead it allows it to pass through . Quote Link to post Share on other sites
Tom Santiago 0 Posted September 24, 2012 Author Share Posted September 24, 2012 humm!! even if this is a piece of temperate glass, its already very especial!! =)) And beutifull piece! Shape of a "marine horse"Now i beat it with another rock, and brokes perfectly! its clean clivage. Mine have some inclusions, red and black....Ill post the photos today night.The rock allows good passage of light but have high refraction and bright shine reflection.rainbow inside!! =))Thx Oredigger!!! I hope this is some rare rock!! =))) Quote Link to post Share on other sites
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