EAS201 Chapter Notes - Chapter 3+4: Mohs Scale Of Mineral Hardness, Conchoidal Fracture, Friedrich Mohs
19 Apr 2016
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Document Summary
Mineral: any naturally formed, crystalline solid with a definite chemical composition and a characteristic crystal structure: naturally occurring, inogranic, fixed composition or range of composition, solid, repeating atomic structure: crystalline. Unfilled outer shells are unstable: stability is created by losing, gaining, or sharing electrons. Higher the charge difference often stronger bonds. Defined as: sharing or transfer of electrons to promote stability. A very strong attraction between two or more atoms. A mobile covalent bond: van der waals. Type of covalent bond where the electrons are free to move among the ions. More of an attraction than a bond. In these covalent bonds here, there will be areas that are more positive, and areas which are more negative. Not actually bonding so they come apart very easily. Bonding in solids typically produces a crystal lattice: regular arrangement, controls many mineral properties. Crystal habit: crystal shape, reflects internal crystal structure. Constant inter-facial angles: usually very diagnostic of the mineral, examples:
