Lustre and Habit
Lustre refers to the sheen on the surface of a mineral or gemstone. The lustre of minerals varies and the main descriptions used by geologists are:
- Vitreous: glass like.
- Adamantine: like a diamond.
- Resinous: a sticky substance.
- Pearly: looking like pearls.
- Silky: with an irregular, needle-like pattern under the surface.
- Greasy: moist or slimy to the touch.
- Earthy: like soil.
- Habit This scientific term describes how minerals look in their natural state. The main descriptions are:
- Acicular: in needle-like shapes.
- Bladed: formed in knife-like blades.
- Dendritic: in branching, tree-like forms.
- Lamellar: in thin, flat sheets.
- Massive: in great lumps, with no particular shape.
- Reniform: in kidney-shaped forms.
- Tabular: in solid, flat tablets.
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