I have decided to go with Silestone countertops. The color I chose is the Amarillo Palmira. I have white cabinets which I am not worried about, but I concerned about my appliances. I have black appliances, how do you guys think this will look, concidering the amarillo palmira doesnt have any black in it?Here is the color...
Generally you will not find quartz and olivine together in an igneous rock. Olivine will form in conditions where silica is low and not enough silica available to form free quartz. You can differentiate olivine and quartz by colour. Olivines (Mg member) are green to orange (fayalite, Fe member) where as quartz is generally clear/glassy. Olivine forms in basic volcanics where as quartz forms in acidic volcanics. The amount silica contained within the magma will also effect the viscosity of the lava. High silica content lavas tend to be thick and are rhyolitic in nature where low silica lavas tend to be thin and flow easily like your classic volcanic eruption. So yes it is possible to identify olivine and quartz in igneous rocks, but rarely occur in the same specimen.
Yes, visually and texture-wise. A polarizing microscope view of the cut rock will show it to you very easily.
Coexistence of olivine and quartz is not stable. They will react to produce a mineral having an intermediary SiO2 content, likely a pyroxene if in presence of magma. Olivine indicates formation from a magma that is depleted in SiO2; quartz indicates formation from a magma that is saturated in SiO2. Pyroxenes and amphiboles form when SiO2 contents of the magma are between the state of SiO2 depletion and SiO2 saturation (intermediate SiO2 contents). Although it is possible for a magma to evolve from olivine-stable conditions to eventual quartz-stable conditions, it would require some rather unique and odd events, and it would be highly unlikely that olivine would persist during the process. Even where there is a secondary overprinting, such as during hydrothermal alteration, the olivine tends to react away before you will see formation of quartz. In practical terms, the alteration could be fracture-oriented, so that there would be a gradient outward from the fracture moving from high SiO2 conditions to low (unaltered) SiO2 conditions, and thus you could see quartz in and near veins but olivine in the bulk rock, but this would simply be a snapshot in an evolving condition. There will be no quartz in contact with olivine.
