Health coverage plus a fund. An Aetna HealthFundÂ® Health Reimbursement Arrangement (HRA)* gives you access to quality care. And it helps you stretch your health care dollars. Our HRA combines an Aetna health insurance or benefits plan with a fund paid for by your employer. This fund helps you pay eligible out-of-pocket health care costs.
Amethyst, a variety of quartz. A mineral is a naturally occurring chemical compound, usually of crystalline form and abiogenic in origin. A mineral has one specific chemical composition, whereas a rock can be an aggregate of different minerals or mineraloids. The study of minerals is called mineralogy.
Mineral Properties. A mineral is a naturally-occurring, inorganic solid which possesses a characteristic internal atomic structure and a definite chemical composition.If we take the definition of a mineral term by term, it becomes easier to understand:Substances that have these features will also have distinctive physical properties such as color, crystal form, cleavage, luster, streak, etc. You can find out more about minerals by clicking on the buttons on the right.f we take the definition of a mineral term by term, it becomes easier to understand: Substances that have these features will also have distinctive physical properties such as color, crystal form, cleavage, luster, streak, etc. You can find out more about minerals by clicking on the buttons on the right.