Types of Crystal Projections
Lecture 2 of the “Crystallography” course
1. Types of crystal projections
A) frontal projection (face-on projection) - the front face of the crystal is drawn in its real
shape and size, the side and the top edges are drawn at an angle to show the volume.
B) oblique projection - the crystal is projected slightly rotated and tilted relative to the
viewer, the front, side, and top faces are visible simultaneously
C) Stereographic projection – the object is placed within an auxiliary imaginary sphere,
the equatorial plane of which serves as the projection plane. We take a point from the
crystal (point A), connect it to the center of the sphere (point O), and extend the line (OA)
until it intersects the surface of the sphere (point A1).We draw a line from point A1 to the
south pole (S), the location where this line intersects the equatorian plane is the
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Lecture 2 of the “Crystallography” course
1. Types of crystal projections
A) frontal projection (face-on projection) - the front face of the crystal is drawn in its real
shape and size, the side and the top edges are drawn at an angle to show the volume.
B) oblique projection - the crystal is projected slightly rotated and tilted relative to the
viewer, the front, side, and top faces are visible simultaneously
C) Stereographic projection – the object is placed within an auxiliary imaginary sphere,
the equatorial plane of which serves as the projection plane. We take a point from the
crystal (point A), connect it to the center of the sphere (point O), and extend the line (OA)
until it intersects the surface of the sphere (point A1).We draw a line from point A1 to the
south pole (S), the location where this line intersects the equatorian plane is the
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