I'm guessing you have all of your textures on on image?
Near the edge of the block, OpenGL is sampling nearby pixels to make it smooth, so on the edge of your dirt block you can see it slightly fading into a stone block
try the lwjgl version of this:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
(the above is in in c++)
This will give you the pixelated effect like minecraft
Take a look at this for some more info http://gregs-blog.com/2008/01/17/opengl-texture-filter-parameters-explained/
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