Rock Gallery

Alabaster

Gallery - Rock Gallery

Written by Boss Tambang Tuesday, 01 December 2009 23:23

Alabaster
 
 
This slightly enlarged image is a polished slab of Italian alabaster, a fine-grained variety of gypsum. Alabaster comes in many colors besides the usual white. This piece also has interesting textures from the process of metamorphosis.

{jgototop}{/jgototop}
Download : PDF | Doc
Search More Related To This Page :

Email Subscription

Enter your email address:

Delivered by FeedBurner

Add new comment
 

Banded Iron Formation

Gallery - Rock Gallery

Written by Boss Tambang Tuesday, 01 December 2009 23:21

Banded Iron Formation

 

 

Banded iron formations are very large bodies of sedimentary rock laid down some 2.5 billion years ago. At that time, the Earth still had its original atmosphere of nitrogen and carbon dioxide. That would be deadly for us but it was hospitable to many different...

Add new comment

Basalt

Gallery - Rock Gallery

Written by Boss Tambang Tuesday, 01 December 2009 23:19

Basalt
 
 

Basalt is a dark, heavy, iron-rich and silica-poor volcanic rock that makes up most of the world’s oceanic crust. It represents the Earth’s upper mantle or, in this case, a hotspot magma that arises from deeper in the mantle. This specimen is a broken cobble picked up at Cape Kumukahi on the...

Add new comment
 

Blueschist

Gallery - Rock Gallery

Written by Boss Tambang Tuesday, 01 December 2009 23:17

Blueschist
 
 
Blueschist is a distinctively Californian rock that forms by the metamorphism of sodiumrich basic rocks at high pressures and low temperatures. Conditions are good for that in northern California, where marine crust and sediments were subducted beneath the North American plate and kneaded by changing tectonic...
Add new comment

Breccia

Gallery - Rock Gallery

Written by Boss Tambang Tuesday, 01 December 2009 23:10

Breccia

 
Breccia (”BRET-cha”) is a rock made of smaller rocks that are cemented together. It is like conglomerate that way. The difference between the two rock types is that breccia is made of sharp, broken clasts while conglomerate is made of smooth, eroded clasts. This is a brecciated mudstone from a northern...
Add new comment
 

More Articles...