The medication has been exposed to cold
Cirrus clouds are commonly found at the top of the troposphere. They are thin and wispy in appearance, formed by ice crystals and often indicate fair weather or the approach of a change in the weather.
A microscope would allow you to observe that salt crystals are box-shaped. By using a microscope, you can magnify the salt crystals to see their structure and shape more clearly, including their box-like appearance.
The mixture of salt and water would be transparent because salt crystals would dissolve in water making no difference in appearance.
Dark purple crystals could indicate the presence of elements such as manganese, iodine, or potassium in their compounds. The color of crystals is often determined by the electronic structure of the element and the way it absorbs and reflects light. Additional tests or analysis would be needed to determine the exact element present in the crystals.
The monetary value of crystals and minerals found in rocks depends on their appearance and rarity to collectors, and on their economic significance to the general market for a particular type of mineral.
Mylan is the name of the manufacturer, not the drug. You would need to indicate any markings as letters or numbers on the med to be able to identify it through a Poison Control Center.
Tyrosine crystals
The resulting texture is called glassy. This texture forms when lava cools so quickly that no crystals have time to grow, resulting in a smooth, glass-like appearance.
Sugar crystals are physical objects.
Asking if something "has luster" is about the same as asking if it "has appearance". EVERYTHING has a luster, the question is "what kind?" For halite, most people would describe it as a glassy or vitreous luster.
Larger crystals suggest slower formation. Crystals would have less time to grow if cooled quickly, and so would be smaller.
There is no actual Greek god of crystals. If you mean land formations, i.e., crystals, it would be Pluto, god of the underworld.