Turquoise?

I can't make it! I tried blue and green, Light blue and light green, blue green and a little yellow, Light blue light green yellow and white. These are all acrylics I use... but it never comes out right it's always too dark. I'm upset because turquoise is my favorite color but I could never paint with it... I always had to use a dark greenish blue. HELP!
This is what I want the color to look like:

http://www.mineralcraft.com/acatalog/ReconTurquoiseTps16.JPG

http://www.redopal.com/hmn/images/e-Turquoise-color-Jasper.jpg

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