Physical Properties of Minerals Color, shape, density, hardness, etc.

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Presentation transcript:

Physical Properties of Minerals Color, shape, density, hardness, etc

Each mineral species has unique and identifiable physical properties. Form and habit (Shape) Luster Color and Streak Cleavage and Fracture Hardness Density Tenacity

Form and Habit Terms (Crystal Growth Forms) Prismatic (well developed prism faces) Columnar (Irregular prism faces) Acicular (needle-like) Botryoidal (rounded growth surface) Tabular (Platey) Stellate (Radiating) Fibrous (fibers, asbestiform) Dendritic (tree-like)

AcicularFibrous DendriticRadiating

BladedBotryoidal PrismaticRadiating

Luster and Transparency Transparency –Opaque –Translucent –Transparent Luster –Metallic –Resinous (waxy) –Pearly –Greasy –Adamantine –Vitreous

MetallicAdamantine VitreousPearly

Color and Streak The reflectance color of minerals is strongly affected by transition metals (V, Cr, Mn, Fe, Co, Ni, and Cu). (Also rare earths) Color in hand specimen may not be diagnostic. Color in streak generally indicates presence of iron or other transition metals.

Chatoyance, Asterism, and Luminescence Chatoyance and asterism are optical effects due to diffraction of light from small inclusions. Luminescence is emission of light. –Visible or UV (black light) –Tribo-luminescence –Cathodo-luminescence is emission of light from electron bombardment

Asterism: Star Sapphire

Cleavage and Fracture Crystals tend to break on planes of weakness. –Cleavage: perfect –Parting: irregular –Hackly: very irregular –Conchoidal Fracture: no cleavage, breaks like glass.

Hardness 1. Talc 6. Orthoclase 2. Gypsum 7. Quartz 3. Calcite 8. Topaz 4. Fluorite 9. Corundum 5. Apatite 10. Diamond

Density Density units are g/cm 3 (water is 1.0) Densities range from 0.92 for ice to ~1.8 for some zeolites to 22 for Os. Most silicates are 2.5 to 3.5. Most sulfides are 4.5 to 6.0 Iron metal is ~8 Lead is ~13 Gold and platinum are

Tenacity: How does it deform? Brittle: Fractures (quartz) Ductile:Malleable (gold) Sectile:Cut with a knife (mica)

Unique Properties Ferro-magnetism Taste (Don’t do it. It might be witherite.) Radioactivity (U and Th minerals) UV Fluorescence Piezoelectricity (acentric crystals) Pyroelectricity (acentric crystals)

Other Properties Optical (Index of refraction) Optical (Birefringence) Optical (Spectroscopy) Chemistry (X-ray and electron fluorescence) X-ray diffraction (+ electron and neutron) Other spectroscopies –IRRaman (visible) –Mössbauer(  )Auger (electron)