- Specialists in Collectible Minerals, Fossils and Gemstones for over 15 years -
Menu
Welcome
About us
▼
The company
Our organization
Newsletter
Services
▼
We buy collections
Video requests
Estimations
Photo service
Custom tumbled stones
Sawing service
Custom Jewelry
Our catalogs
▼
Minerals
Fossils
Gemstones
Tumbled stones
Jewelry
Crystal library
Polished eggs and balls
Meteorites
Free custom boxes
Wholesale lots
Material
Books
Gift cards
All our updates
Tips / Informations
▼
Mineral Encyclopedia
Glossary
Stones Healing Dictionnary
Our articles
Fun activities
Mineralshows
Downloads
How to order and pay ?
English
▼
Français
English
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
By classes
By crystal systems
By chemistry
Mineral list
Minerals for sale
Encyclopedia
Glossary
All minerals
1€ to 20€
20€ to 100€
100€ to 250€
Up to 250€
All minerals
1€ to 20€
20€ to 100€
100€ to 250€
Up to 250€
All minerals
1€ to 20€
20€ to 100€
100€ to 250€
Up to 250€
What is an intrusion in geology ?
Intrusion : definition
In geology, an intrusion is a mass of
igneous
rock placed at a variable depth. Erosion gradually brings it to the surface, where it gives usually well-circumscribed massifs.