The GSWA (Geological Survey of Western Australia) have produced a number of qml style files for some of their regional geological datasets. At the moment they appear to work OK for v2 but not v3. I have contacted the GSWA regarding this issue. In the meantime, you can open the relevant files in v2 using the style files, then save as a new qml file and this new qml file can then be used in v3. Let me know if anyone has any problems or issues.