When taking photos especially for mineral identification, it's always going to be tough for the people trying to identify unless they are a 30+year rockhounder or a geo. Some minerals look very similar and they are usually identifiable by things like cleavage, fracturing, lustre, colour and streak colouring. Because we can't physically hold the rock, things to consider when photographing samples include:
- Appropriate zoom and focus. Some lens have a short field of depth, so the front of the mineral will be in focus but the back won't be, so obviously we want to avoid this
- Good lighting (indirect sunlight is usually best, think about looking at gemstones/crystals at day versus under kitchen lighting at night)
- A non-blurry image, so using a tripod or having the camera rest on a table or a book
- Sometimes, shining a light up through the mineral to highlight translucency or mineral features can help with identification