Cleavage
* All cleavages are equal and the blastomeres are loosely arranged rather than in tiers of cells.
* Most cleavages involve division.
* are areas
  - chemical processes
  - part of pregnancy
  - states
  - well developed and commonly seen in specimens in rocks
* begins in the gastric pouches
  - to form between the single cell, dividing into two
  - while the egg is still in the hen s oviduct
* can form steps on the outside of the crystal, each parallel to the cleavage direction.
* characteristic of the bond strength of mineral.
* clean split along a flat surface.
* continues as the embryo develops
  - moves down the oviduct toward the uterus
* continues, forming a mass of cells which organizes itself into the blastula.
* describes a mineral that breaks along flat surfaces.
* ends up producing a blastula, a hollow ball of cells
  - with the formation of the blastula
* follow synchronously and rapidly.
* furrows form in animal cells, and cell plates form in plant cells
  - now appear in the cytoplasm, which divide the contents into zoospores
* gives rise over a number of hours to hundreds of cells.
* involves subdivision of a huge cell into smaller and smaller cells.
* is almost indiscernible in one direction
  - an orderly process of cell division
  - cellular division
  - confined to animal pole
  - described according to the crystal direction and how easily it is obtained
  - distinct in one direction
* is distinct in two directions lengthwise, prismatic
  - equal and spiral, and no polar lobes are formed
  - fair in four directions forming octahedrons
  - faster in the pigmented animal pole
  - force concentrated at one edge and exerts a prying force
* is good in one direction but only seen in the larger crystals
  - parallel to the flat pinacoid face
  - three directions forming cubes
  - two directions at right angles
  - guided by the atomic structure
* is holoblastic and equal
  - radial forming different types of blastula and gastrula
  - rotational
* is imperfect in one direction
  - two directions, prismatically
  - indeterminate and spiral
  - indistinct in one basal direction
  - made up of two separate processes, karyokinesis and cytokinesis
* is one of the most useful properties for identifying common minerals
  - property that is undeniably tied to the structure of a mineral
* is perfect in four direction forming cubes
  - one direct but only distinct in another
* is perfect in one direction and distinct in another
  - distinct in two other directions
  - forming thin sheets
* is perfect in one direction parallel to the a and c axes
  - to the prominant pinacoid
  - producing thin sheets or flakes
* is perfect in one direction, basal
  - less so in another direction
  - several oblique directions
  - the lengthwise direction
  - three directions, forming rhombohedrons
* is perfect in two directions at close to right angles
  - forming splintery fragments
* is poor in one direction, basal
  - three directions parallel to the faces of the rhombohedron
* is poor in two directions parallel to the prism faces
  - prismatically and in the basal direction
  - present along planes separated by microscopic dimensions
* is related to the mineral's crystal structure
  - structure of the mineral and is usually parallel to other mineral faces
  - sometimes distinct in three directions forming rhombohedrons
  - superficial, at one pole of the large yolky cytoplasm
* is the first few mitotic divisions of the fertilized egg
  - stage of embryogenesis
  - initial division of a fertilized egg
  - number of directions of smooth planar breakage
  - tendency of a mineral to break in certain preferred directions along smooth planes
* is the way minerals split along planes of weakness
  - that a mineral breaks along well-defined planes of weakness
  - thus a direct consequence of the geometry and the type of atomic bonds within a mineral
* is total and quite regular, forming a hollow, single-layered blastula
  - spiral, and often unequal
* is total, equal and of a typical spiral nature
  - unequal and spiral
  - unequal, and regular
  - unequal and spiral, and the micromeres are relatively large
* is unequal and spiral, with large polar lobes appearing during the first two divisions
  - polar lobes forming during the first two divisions
  - usually in three directions parallel to the rhombohedron form
  - very poor in two directions
* leads to morphological and biochemical changes in the virus particle.
* new fabric the develops in rocks during deformation.
* occurs as the zygote is passing along the oviduct before the egg is laid
  - at oblique angles with daughter cells either moving to the right or to the left
  - in oviduct
  - typically in either one, two, three, four, or six directions
* provides the embryo with a large number of cells for continuing the trip.
* refers to a smooth parting
  - planes of weakness in a crystal structure along which a crystal tends to break
* refers to the egg dividing into numerous cells
  - way that a mineral breaks
* series of mitotlc cell divisions that transform the zygote into a blastula
  - rapid cell divisions that produce a ball of cells from the zygote
* sometimes competes with saponification.
* surface usually parallel to a crystal face.
* takes place along planes that cut across the longest, weakest bonds in the structure.
* test to determine the way a mineral splits in planes.