First law of crystallography

What is solid state law of crystallography?
This law states that angle between adjacent corresponding faces is inter facial angles of the crystal of a particular substance is always constant inspite of different shapes and sizes and mode of growth of crystal.
The size and shape of crystal depend upon the conditions of crystallisation..
What is the second law of crystallography?
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1. Hauy's law of rationality of indices: the intercepts of any face of plane of a crystal on suitanle crystallographic aces can bw expressed by small multiples of three unit distances a,b,c or some simple integral muktiple m,n,p of these unit distances , i
Who discovered the law of rationality of indices in crystallography?
The law of rational indices was deduced by Ha\xfcy (1784, 1801) from the observation of the stacking laws required to build the natural faces of crystals by piling up elementary blocks, for instance cubes to construct the {110} faces of the rhomb-dodecahedron observed in garnets or the \xbd{210} faces of the pentagon- .
The Law of constancy of symmetry : In accordance to this law, all the crystals of a. substance have the same elements of the symmetry is the plane of symmetry, the axis of symmetry and the centre of symmetry.
This law states that the ratio of intercepts of different faces of a crystal with the three axes are constant and can be expressed by rational numbers that the intercepts of any face of a crystal along the crystallographic axes are either equal to unit intercepts (i.e., intercepts made by unit cell) a, b, c or some

The law of the constancy of interfacial angles (also called the 'first law of crystallography') states that the angles between the crystal faces of a given species are constant, whatever the lateral extension of these faces and the origin of the crystal, and are characteristic of that species (Fig. 1).

Overview

Niels Steensen ( Danish: Niels Steensen; Latinized to Nicolaus Steno or Nicolaus Stenonius ; 1 January 1638 – 25 November 1686 [ NS: 11 January 1638 – 5

Early life and career

Niels Steensen was born in Copenhagen on New Year's Day 1638 ( Julian calendar)

Scientific contributions

During his stay in Amsterdam, Steensen discovered a previously undescribed structure

Religious studies

Steensen's questioning mind also influenced his religious views. Having been brought up in the Lutheran faith

Beatification

After his death in 1686, Steensen was venerated as a saint in the diocese of Hildesheim

When was crystallography first used?

The word ‘crystallography’, introduced in 1723 by the Swiss physician, Maurice Capeller, was first applied to the study of quartz

The law of the constancy of interfacial angles (or 'first law of crystallography') states that the angles between the crystal faces of a given species are constant, whatever the lateral extension of these faces and the origin of the crystal, and are characteristic of that species.Shortly after, Romé de l’Isle (1782) stated the first law of symmetry, a law called the constancy of interfacial angles, which we commonly call Steno’s law. This law states that: blank ■ Angles between equivalent faces of crystals of the same mineral are always the same. Steno’s law acknowledges that the size and shape of the crystals may vary.