THE COLOR OF MINERALS

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yellow and smoky

dark and purple

Through

depend on the position they occupy in the crystalline structure of each mineral

Chromophores

Main chromophore elements

copper (Cu)

cobalt (Co)

titanium (Ti)

manganese (Mn)

iron (Fe)

chromium (Cr)

When light is transmitted through a mineral

If it does not absorb any length

The mineral is colorless

It is produced

Another type of idiochromic mineral

electron transfers between different ions

trivalent iron ores

Mineral fine powder color

Name: Karen Dayanna Molina Rincón Class Name: Mineralogy and Crystallography

Impurities in the crystal lattice

Under the microscope

between

THE COLOR OF MINERALS

Three main groups

Pseudochromatic Minerals

False colors

Variable color and unique mineral property

bright reflections of labradorite

Precious opal

Allochromatic Minerals

Other colors

Variable and unpredictable property

Impurities

Rose on quartz

yellow in Heliodor (spodumene)

blue on Amazonite (orthoclase)

Idiochromic Minerals

Own color

Constant and predictable component

malachite green

red cinnabar

Blue azurite

To describe the color

Methods continue to be developed

colors of metals or alloys

Copper red (native copper)

Brass yellow (chalcopyrite)

Steel gray (molybdenite)

Tin white (Arsenopyrite)

Comparative evaluation

with "color standards" of minerals

Emerald green

Vermilion red

with the color of some commonly known object or substance

Blood red

Lemon yellow

Green apple

Indigo blue

Distinction

Color of minerals

In individual crystals and mineral chunks

Color of a mineral

streak

In polished sections

In reflected light

In thin sections

Transparent

Metallic and covalent compounds

Native metals, sulfides and their analogues

Fundamental absorption band

cuprite

orpiment

cinnabar

Optical Interzonal Electron Transfers and Related Reflection Maxima

Metallic shades (Gold)

Metallic shades (Pyrite)

Associated with transition metal ions

Chrysolite

Rhodonite

Rubelite

Ruby

Emerald

Caused by radioactivity

natural ionizing radiation

formation of color centers of electron holes

calcite

Quartz

fluorite

halite

Importance

Mineral identification

provides information

Genetics of minerals

Crystallochemical characteristics

Main qualitative characteristic

Semi precious stones

Gems