Cheese crystals are whitish, semi-solid to solid, slightly crunchy to gritty

crystal A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macr ...

line spots, granules, and aggregates that can form on the surface and inside of

cheese Cheese is a dairy product produced in wide ranges of flavors, textures, and forms by coagulation of the milk protein casein. It comprises proteins and fat from milk, usually the milk of cows, buffalo, goats, or sheep. During product ...

. Cheese crystals are characteristic of many long-aged

hard cheese There are many different types of cheese. Cheeses can be grouped or classified according to criteria such as length of fermentation, texture, methods of production, fat content, animal milk, and country or region of origin. The method most com ...

s. Hard cheeses where cheese crystals are common and valued include comté, aged cheddar, grana cheeses like

parmesan Parmesan ( it, Parmigiano Reggiano; ) is an Italian hard, granular cheese produced from cows’ milk and aged at least 12 months. It is named after two of the areas which produce it, the provinces of Parma and Reggio Emilia (''Parmigiano'' i ...

grana padano Grana Padano is a cheese originating in the Po river Valley in northern Italy that is similar to Parmigiano Reggiano cheese. There are less strict regulations governing its production compared to Parmigiano Reggiano. This hard, crumbly- texture ...

, and

Pecorino Romano Pecorino Romano () is a hard, salty Italian cheese, often used for grating, made with sheep's milk. The name "pecorino" simply means "ovine" or "of sheep" in Italian; the name of the cheese, although protected, is a simple description rather t ...

, as well as old gouda. However, in some cheeses, like industrial cheddar, they are considered a production defect. Cheese crystals can consist of different substances. Most commonly found are

calcium lactate Calcium lactate is a white crystalline salt with formula , consisting of two lactate anions (CHOH) for each calcium cation . It forms several hydrates, the most common being the pentahydrate ·5. Calcium lactate is used in medicine, mainly to t ...

crystals, especially on younger cheese, on the surface, and on cheddar. Depending on the cheese and its age, these crystals can consist of either or both

enantiomer In chemistry, an enantiomer ( /ɪˈnænti.əmər, ɛ-, -oʊ-/ ''ih-NAN-tee-ə-mər''; from Ancient Greek ἐνάντιος ''(enántios)'' 'opposite', and μέρος ''(méros)'' 'part') – also called optical isomer, antipode, or optical ant ...

s. For grana padano, grainy

amino acid Amino acids are organic compounds that contain both amino and carboxylic acid functional groups. Although hundreds of amino acids exist in nature, by far the most important are the alpha-amino acids, which comprise proteins. Only 22 alpha ...

crystals inside the cheese consisting mainly of

tyrosine -Tyrosine or tyrosine (symbol Tyr or Y) or 4-hydroxyphenylalanine is one of the 20 standard amino acids that are used by cells to synthesize proteins. It is a non-essential amino acid with a polar side group. The word "tyrosine" is from the Gr ...

and of

leucine Leucine (symbol Leu or L) is an essential amino acid that is used in the biosynthesis of proteins. Leucine is an α-amino acid, meaning it contains an α- amino group (which is in the protonated −NH3+ form under biological conditions), an α- ...

and isoleucine have been reported. In general, any substance that has a low solubility in water and a tendency to crystallize could form crystals as the cheese dries out during aging.{{Cn, date=March 2021

References

Characteristics of cheese