Use APKPure App
Get Minerales Geología Guía old version APK for Android
Have the mineral guide on your mobile for free
In this application you can consult all the information of the minerals.
You will have your minerals saved, you will be able to check the hardness scales.
You have an alphabetical list and search by characteristics.
If you have Spen you can control the card with your pencil and change images with it.