File Type Name: SCSS (also known as SASS)
Filename Extensions: .scss
SCSS/SASS is
Specifications: http://sass-lang.com/documentation/file.SASS_REFERENCE.html
Keywords: The above documentaion covers this, I don't see any single place that explicitely lists everyting.
Comments: Identical to JavaScript, /* multi-line comments */ // single line comments
Delimiter Highlighting: It's essentially the same thing as CSS with added functioanlity.
Example Code: https://github.com/ddemaree/ala_sass_examples
Honestly I haven't used much of SCSS just yet because your app doesn't support it. It seems like something really useful and powerful, and it's growing more nad more popular. It's almost exactly the same as CSS, with a bit of added functionality, so I think you should be able to use almost all of the same styles/etc from that stuff.