I think you can pretty easily ID rough with what you have...if you've cu a window in the rough and determined the RI, then you can also determine birefringence and dispersion with the refractometer, and also optic sign and optic character. This, along with a visual examination with magnification, should tell you what you need to know. It is also possible, using a small plastic cup of water, a little thread and the tare function on your scale, to determine an SG. Weigh the specimen suspended in the water, then weigh it sitting on the bottom of the cup, and compute SG. You can spend almost nothing to get a tile for determining streak and use a few common objects around the home (copper penny, knife, piece of quartz, various synthetic gems) to develop a set of hardness points which you can use to estimate hardness. Light from a cell phone is polarized, so get a white screen app and, placing your specimen on the phone, use the lens from a pair of polarized sunglasses to give you a polariscope and you can determine SR vs DR or ADR that way. I disagree that it is tougher to ID rough than cut stones and you can see why I say that above.
If you are willing to spend a liittle more money, get a purple/UV laser to determine long wave UV response and buy a standard magnet for determining magnetic susceptibilty (go to gemstonemagnetism,com). You could also consider getting a strainless sphere (acrylic ball) and cutting a side off a plastic box (or use cellophane from the florist) for a quartz wedge simulator to determine optic sign and character with your cell phone polariscope. I think you can find instructions for that on line. The more gemology you know, the fewer tools you need. All of this stuff (except the magnetic stuff) is in Hanneman's book, Affordable Gemology, but probably the hints I've given here will do for the resourceful. SG plus optic sign and character with appearance, hardness and inclusions should tell you all you need to know. The UV laser and magnet are added, easy tests. Forty bucks on ebay will get you a dichroscope and spectroscope, should you want to play some more. Help, I'm talking about gemology and can't shut up...LOL