I've made it a general policy to deposit my minerals when they are worth 4 or more crowns. As a result, my red, green and yellow minerals tend to stay at low values, while my blue and purple mineral stockpile just keeps growing and growing. Looking at the price values, moonstone and dark matter tend to only occasionally reach 3 crowns in value.
Any idea why this might be the case? And has anyone ever seen blue or purple minerals worth 4 or more?
i have seen them grow