Silicate Structures
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15 Terms
Which mineral has the independent tetrahedra structure?
Olivine
Does the independent tetrahedra structure have cleavage?
No; it has fracture only.
What is the Si:O ratio for the independent tetrahedra structure?
1:4
Which mineral has the single chains structure?
Pyroxene (Augite)
Does the single chains structure have cleavage?
Yes; 2 cleavage planes + fracture on other side
What is the Si:O ratio for the single chains structure?
1:3
Which mineral has a double chains structure?
Hornblende
Does the double chains structure have cleavage?
Yes; 2 cleavage planes
What is the Si:O ratio for the double chains structure?
1:2.75
Which mineral has a sheets structure?
Micas; Biotite
Does the sheets structure have cleavage?
Yes; 1 cleavage plane
What is the Si:O ratio for the sheets structure?
1:2.5
Which mineral has a 3D frameworks structure?
Quartz; Feldspar
Does the 3D frameworks structure have cleavage?
Quartz is fracture only; Feldspar has cleavage
What is the Si:O ratio for the 3D frameworks structure?
1:2