× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
d
4
N
3
3
R
3
k
3
o
3
Z
3
j
3
s
3
d
3
J
3
1
3
Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
New Topic  
zzz zzz
wrote...
Posts: 98
Rep: 1 0
12 years ago
i can't seem 2 find this info in my text book =[
please help
Read 1006 times
2 Replies

Related Topics

Replies
wrote...
#1
12 years ago
The first crystals that form in fractional crystallization form at very high temperatures.  This allows a lot more cooling time than crystals formed later.  It is the cooling time that ultimately determines that shape of a crystal.  ie: aphanitic, phaneritic, porphyritic...

The long cooling time thus allows the distinct crystal shape to form.
wrote...
#2
12 years ago
Because they are growing into a liquid that moves out of the way.  The crystals form whatever faces that stabilise them by lowering interfacial energy.

When there are a lot of crystals, new growing crystals are not growing into space but are impinging on other crystals and so have to accommodate themselves to the space available.
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1278 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 244
  
 1849
  
 317
Your Opinion
Who's your favorite biologist?
Votes: 608
Previous poll results: Which 'study break' activity do you find most distracting?