[DOC] [TLE] Nacre - Wikipedia [PAR] Nacre also known as mother of pearl, is an organic-inorganic composite material 
produced by some molluscs as an inner shell layer; it also makes up the outer 
coating of pearls. It is strong, resilient, and iridescent. Nacre is found in some of 
the most ancient lineages of bivalves, gastropods, ... Nacre is composed of 
hexagonal platelets of aragonite (a form of calcium... [DOC] [TLE] Pearl - New World Encyclopedia [PAR] Pearls are formed inside the shell of certain bivalve mollusks when nacre is ... 
Also known as mother of pearl, nacre is secreted by the epithelial cells of the 
mantle tissue ... Nacre is composed of layers of calcium carbonate separated by 
layers of an ... The iridescent inner layer of nacre found in mollusk shells is 
considered... [DOC] [TLE] Nacre | Podcast | Chemistry World [PAR] ... reach the inner layer of nacre, also made essentially of calcium carbonate  
the ... Windowpane oysters, also called capiz shells, were used for centuries in 
Asia to ... they are made mainly of calcium carbonate but theirs is laid down in 
layers of ... Scales, extracting some pearls of wisdom there, with the chemistry of 
nacre. [DOC] [TLE] Nacre [PAR] The material comprising mother of pearl is called nacre. ... delicate internal 
tissues, but is also responsible for shell secretion (in forms that have a shell). ... of 
solid calcium carbonate used in the construction of the various layers of the shell. 
... The nacreous layer (composed mostly of plate-like tablets of aragonite), is 
shiny,... [DOC] [TLE] Sponges and Cnidarians | CK-12 Foundation [PAR] Feb 29, 2012 ... nacre: The iridescent inner shell layer produced by some bivalves, some 
gastropods, and some cephalopods; also known as mother of pearl. ... radula: A 
molluscan feeding structure, composed mostly of chitin. ... The mantle also 
releases calcium carbonate that creates the external shell, just like the ones... [DOC] [TLE] Mollusks | CK-12 Foundation [PAR] Sep 17, 2009 ... Mollusks also have a mantle, a fold of the outer skin lining the shell, which in 
most mollusks secretes a calcium carbonate external shell, just like the ... The 
radula is composed mostly of chitin, a tough, semitransparent substance ... Nacre 
is an iridescent inner shell layer produced by some bivalves, some... [DOC] [TLE] How are seashells created? Or any other shell, such as a snail's or a ... [PAR] Such shells have three distinct layers and are composed mostly of calcium 
carbonate ... a prismatic layer (calcified) and an inner pearly layer of nacre (
calcified). In comparison, turtle shells are part of the vertebrate animal's so-called 
endoskeleton, ... Why exoskeletons of snails and clams are calcium carbonate 
while the... [DOC] [TLE] GlossaryP [PAR] Abalone : Univalve mollusk known for its shell, meat, and iridescent natural 
pearls. Akoya : Pearl produced by the Japanese Akoya oyster, also called 
Pinctada ... Calcium carbonate material, the major constituent of pearl layers or 
nacre. .... certain mollusks and some bivalves and composed mainly of calcium 
carbonate and... [DOC] [TLE] The origin of the color of pearls in iridescence from ... - Rice University [PAR] have shells composed of an outer fibrous periostracum covering a calcitic ... layer 
projects beyond the inner layer to form a lip at the edge of ... The iridescent colors 
of South Sea Pearls and their shells have ... evidence that the pearl nacre color is 
related to the nature of the ... acid were first called conchiolin by Frmy (1855). [DOC] [TLE] View PDF Version - RSC Publishing - Royal Society of Chemistry [PAR] May 4, 2012 ... Nacre (known as mother of pearl) is the iridescent inner shell layer of some 
mollusks. Nacre is composed of 95 wt% aragonite (a crystallographic form of 
CaCO3) and 5 wt% ... columnar calcite), and the inner layer is nacre (also known 
as ... the most common and have been studied the most.1,9 Some. [DOC] [TLE] 3) Mother of Pearl work - CREATION GEMS [PAR] Nacre pronounced /nekr/[1] or "NAY-kr", also known

Question: Also called nacre, this iridescent inner layer of certain shells is composed mainly of calcium carbonate
Answer: Mother-of-pearl