Rhyolite with mica cristals.
In this blog I will upload pictures of stones and fosils that I will find in my excursions, so I will explain what kind of rock that I think they are and more... I am not a geologist...
Rock #7 Basalt ¿?
This basalt stone was found in the beach and it was broken easily, may be because of its vitreous composition.
Rock #6 Reef limestone fossil
This limestone obteined from the same place than rock #4 and #5 sometimes the sandstone is made of reef sand.
Rock #4 Red Sandstone
The red colour (iron oxide) is removed with water and a brush, red sandstone obtained from this place:
Rock #3 Purple marl
Purple Marl obtained from this vein between other yellow marl veins:
This purple marls in this place usually are triasic stones.
Maybe is lutite. Marl contains calcite CaCO3, lutite not contains it. CaCO3 reacts with HCl.
The place is cenozoic then is marl.
The place is cenozoic then is marl.
Rock #2 Carniola (spanish)
Carniola is a sedimentary carbonated evaporite stone¿? its formarion is due to precipitation over, limestone, Dolostone or Anhydrite, which disaperar and leave the holes.
My first rock, Coquina limestone!!
Coquina limestone, variety of reef limestones formed in Jurasic. Coquina is a typical mediterranean (but can live arround th world) bivalve:
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