Bytownite: The plagioclase feldspar mineral Bytownite info & pictures.
1. EESC 1101: Introduction to Earth Science. Silicate Minerals. ISOLATED TETRAHEDRA SILICATES. OLIVINE. (Fe,Mg)SiO4. Luster: Streak: Cleavage/ Fracture.
·Relief and cleavage - low relief, may show disoriented fractures but never has. ·Distinguishing quartz from plagioclase or alkali feldspars may be difficult.
Cleavage or Fracture- If a mineral breaks along flat, smooth surfaces it shows. Feldspar- cleavage in two directions, see the diargam below (lower left). Calcite.


Lab Assignment - Academic Home Page.
"Can a mineral have both cleavage and fracture? cleavages—some in only one direction (like mica), others in two directions (like feldspar), and some in three.

Can a mineral have both cleavage and fracture? - Yahoo!7 Answers.

feldspar cleavage fracture

How does feldspar and quartz differ chemically? - Yahoo! Answers.
Identifying Minerals - Streak Color Luster Cleavage Fracture.docx.

Orthoclase: The mineral Orthoclase information and pictures.

Cleavage and Fracture Lab Mineral Cleavage Mica Basal-one direction Feldspar Pinacoidal-two directions Halite Cubic-three directions at right angles Calcite.
Oligoclase feldspar: The mineral Oligoclase information and pictures.

feldspar cleavage fracture