• WordNet 3.6
    • adj microcrystalline containing crystals that are visible only under a microscope
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Webster's Revised Unabridged Dictionary
    • a Microcrystalline (Crystallog) Crystalline on a fine, or microscopic, scale; consisting of fine crystals; as, the ground mass of certain porphyrics is microcrystalline .
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Century Dictionary and Cyclopedia
    • microcrystalline Minutely crystalline: said of crystalline rocks of which the constituents are individually so minute that they cannot be distinguished from each other by the naked eye; cryptocrystalline. Many lithologists use microcrystalline and cryptocrystalline as synonymous. Rosenbusch, however, uses the former term to designate that structure of the ground-mass in which the constituent minerals can, with the aid of the microscope, be specifically determined, and the latter for a structure which can be recognized as crystalline, but in which the individual components cannot be specifically identified.
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Webster's Revised Unabridged Dictionary
Micro-, + crystalline,


In literature:

It is never found as crystals, but always as encrusting and botryoidal masses with a microcrystalline structure.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3" by Various

In news:

The authors studied the behavior of anhydrous lactose and the combination of anhydrous lactose and the combination of anhydrous lactose with microcrystalline cellulose on a pilot-scale roller compactor.
Is increasing its global prices on microcrystalline cellulose, carrageenan, alginate products, and other gums up to 15% or as contract terms permit in food, personal care, and other market segments.
Microcrystalline cellulose, vaccinium myrtillus fruit extract, orange extract, and lemon extract (exfoliators).

In science:

Sheaf system, formed from coalescing rods of anastamosing microcrystalline pyrite.
Magnetism, FeS colloids, and Origins of Life
In a configuration generated by the addition method the deviation from quasiperiodicity is much stronger (Fig. 6): There are microcrystalline inclusions which indicate large-wavelength fluctuations in the higher-dimensional space.
Random tiling quasicrystals in three dimensions
In a configuration generated by the addition method with microcrystalline inclusions there are few possibilities for flips.
Random tiling quasicrystals in three dimensions
Take for instance two iron blocks: we shall never be able to make them the same weight and the same shape; we might also try to forge them with the same microcrystalline structure, with the same annealing, with the same impurity content and so on.
Enrico Fermi's view of identical particles