This document discusses the properties of minerals. It defines a mineral as a naturally occurring inorganic solid with a characteristic internal structure and definite chemical composition. It then describes several key mineral properties - color, lustre, cleavage, hardness, and streak. Examples are provided for common minerals like quartz, feldspar, calcite, halite, and micas, noting the typical values for each property in these minerals. The document serves to introduce the main properties used to identify and describe minerals.

1. MINERALSMINERALS
Ángel Moreno Cañada. 1ºC.

2. What is a mineral ?
A mineral is a A mineral is a naturally ocurring ,inorganic, solid
which possesses a characteristic internal atomic
structure and definite chemical composition
Examples of minerals

3. What is a rock
A rock is a natural solid composed of multiple
crystals of one or more minerals
Examples of rocks

4. Colour:Is the first thing someone notices when
they view a mineral.
Lustre: is a description of the way light interacts
with the surface of crystal.
Cleavage: when a mineral breaks it does so either
by fracturing or by cleaving.
Hardness: a good property in mineral
identification the hardness.
Streak: often demonstrates the true or inherent
their color variable.
The name of the propertys of minerals and the
description of the property

5. Special terminology used to describe this
property
Colour: yellow, bronw, blue, red, gray, purple,
orange...
Lustre: crystal habit, index of refraction.
Cleavage: good, distinct, cubic, octahedral,
perfect.
Hardness: weak, strong.
Streak:milky, smoky pink, smoky.

6. This propertys in some minerals
 MINERAL:QUARTZ
 COLOUR:White, Purple, Pink , Smoky
 LUSTRE:Criptocrytolline,waxy can be vitreous
 CLEAVAGE:Is very weak (rhombohedral)
 HARDNESS: 7
 STREAK:Is white
 INTERESTING:Silica for glass,Electical
components,Optical lenses, Abrasives

7. This propertys in some minerals
 MINERAL:QUARTZ
 COLOUR:White, Purple, Pink , Smoky
 LUSTRE:Criptocrytolline,waxy can be vitreous
 CLEAVAGE:Is very weak (rhombohedral)
 HARDNESS: 7
 STREAK:Is white
 INTERESTING:Silica for glass,Electical
components,Optical lenses, Abrasives

8. This propertys in some minerals
 MINERAL:FELDESPAR
 COLOUR:WHITE , GRAY ,or colorless can be
pale stades of other colors
 LUSTRE:Is vitreous to dull if weathered
 CLEAVAGE: Is perfect in one and good
direction forming nearly right angled prism
 HARDNESS: 6- 6,5
 STEAK:Is white
 INTERESTING: Only as mineral speciem
c

9. This propertys in some minerals
 MINERAL:CAlCITE
 COLOUR:YELLOW,ORANGE,BLUE, PINK ,
BRONW, GREEN, BLACK AND GRAY
 LUSTRE:Is vitreous to resinous to dull in
massive form
 CLEAVAGE:Is perfect in three directions,
forming rhombohedrons
 HARDNESS: 3
 STREAK: Is white
 INTERESTING: In cements and mortars

10. This propertys in some minerals
 MINERAL:HALITE
 COLOUR:Is clear or white but can be found Blue ,
Purple , Pink, Yellow and Gray
 LUSTRE:Is vitreous
 CLEAVAGE: Is perfect in three directions forming
cubes
 HARDNESS:2
 STREAK:Is white
 INTERESTING: Major source of salt and as mineral
specimens

11. This propertys in some minerals
 MINERAL: MICAS
 COLOUR: Is White, Silver, Yellow, Green,
Bronw
 LUSTRE: Is vitreous to pearly
 CLEAVAGE:Is perfect in one direction
producing thin sheets or flakes
 HARDNESS: 2- 2,5
 STREAK: Is white
 INTERESTING: Heat and Electrical insultator
for industrial purposeses