Chromite = FeCr2O4, Iron Chromium Oxide
Location source = Kon Dag Turkey
Specimen size = 1” long x ¾” wide x ½” thick
Color is too dark

Same chromite specimen as shown above, but at 10x.
Color is accurate.

Chromite same as pictured in above two images.
Color of rock fragment is accurate.
This image is a fragment (1/8" long x 1/16" wide x 1/16" thick) removed from the above pictured specimen.
Image created with B&L SZ5 microscope @ 40x, coupled to a ccd camera and computer.
No sublimate formed even though prolonged heating was employed. In fact, the intense heat did not even round the corners, which suggests that a much higher heat without fluxes is required to create any sublimates. The heat has changed color of minerals within this rock fragment and caused extensive plaster tablet cracking.
The crystal rests in a carved out depression to help keep the mineral in confined area so the blast from propane torch would not dislodge it.
Additional blowpipe and simple chemical tests can be applied to confirm or deny if chromite.
Sometimes when heat is applied to minerals they become magnetic, and this fragment is affected by a magnet.
Note: when applying heat to any rock fragment I slowly warm it first, then gradually allow the higher heat to engage the fragment to avoid it blowing up, bursting or spitting sending tiny fragments all over the tablet.

10x
Chromite
Color of specimen is accurate.
This image is the same fragment on same plaster tablet as the above image, but has been subjected to the intense heat generated by the propane and oxygen torch (oxidizing part of flame).
Some melting has occurred, but no appreciable sublimate has formed, except a slight greenish coloration in immediate proximity of rock fragment subjected to prolonged heating.
Additional blowpipe tests with fluxes are required to confirm or deny if chromite.
Note: When applying heat to any rock fragment I slowly warm it first, then gradually allow the higher heat to engage the fragment to avoid the fragment from blowing up, bursting or spitting sending tiny fragments all over the tablet, as well as into the eyes, which strongly suggests that safety glasses be worn.

Uvarovite (Calcium Chromium Silicate)

Uvarovite (Ca3Cr2(SiO4)3)
Source = Quebec, Canada
Size = about 1 1/2" by 1" by 3/4".

50x
No sublimates formed.
The emerald green garnets were totally unaffected by the heat from the oxidizing propane torch.
Image Created with a Reichert monocular microscope coupled to a ccd camera & computer.
Color = almost correct, except where shadows and external light source is being reflected.