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Tom Santiago

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    RJ Brazil
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  1. 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!! =)))
  2. Hey Orediger62 / Lewis, this rock is a nice piece!! Seems like cousin of mine! =) What is it??
  3. 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/cm3 Hardness = 7 +- or more. Strake = incolor not 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.
  4. 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 scale And 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,
  5. its cristaline! some here tells me that its a diamond, rsrsrsrs for the shiny light and refraction... but i duunmo too! Other says a Opal, Citrine and Qartz
  6. 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!!
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