10 Questions
What is the defining characteristic of a parametral plane?
It is parallel to all three crystallographic axes.
Which statement accurately describes the intercepts on crystallographic axes?
The intercept on a-axis is written after 'a' and on b-axis before 'b'.
What happens when a crystal face is parallel to a specific axis?
It cuts that axis at infinity.
What is a parametral plane in crystallography?
A plane that cuts all three crystallographic axes
How are the intercepts made by any face on the crystallographic axes described in the text?
They are always rational multiples of the intercepts made by the unit form
What does Hüvy’s law of rational indices state in crystallography?
The indices of crystal faces are determined by dividing the intercepts of the parametral plane and clearing fractions
What is the relationship between parameters and indices?
Indices are reciprocals of parameters
What does the parameter 0.374 (a):1 (b): 0.444 indicate about a crystal face?
Intersects a-axis at 0.374 units, b-axis at 1 unit, and is parallel to c-axis
How is the Weiss symbol represented for a crystal face parallel to the c-axis?
2a b ∞ c
How is a crystal face defined by indicating their intercepts on the crystallographic axes?
By indicating their lengths on the axes
Explore the concept of parametral plane in crystallography, a plane that cuts all three crystallographic axes and consists of a series of numbers expressing the intercepts on those axes. Learn about parametral faces, which are faces on a crystal that cut all three axes and define the lengths of each axis for a mineral.
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