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Aragonite needles

Crossed lamellar structure aragonite needle crystals align in the c-axis direction forming rectangular blocks. The c-axes are inclined at 45 — 55° to the inner surface of the shell, and the neighboring blocks are oppositely inclined. [Pg.267]

Complex crossed lamellar structure a layer consisting of aragonite needle crystals with orientations inclined at 45° to the inner portion of the cell. These needle crystals aggregate in a radial manner, forming a conical body, which is arranged nearly perpendicularly to the inner surface of the shell. [Pg.267]

Composite prismatic structure the c-axis of rhombic prisms align parallel to the shell. The rhombic prism is an aggregation of aragonite needle crystals aligned in conical form in its elongation direction. [Pg.267]

Amino acid Hydroides (Serpulid) (Worm tubes) Porites (Sclerac- tinian) (coral) k unicea (Alcyo- narian) (coral) Oolites (Bahamas) Aragonite Needle mud (Bahamas)... [Pg.30]

One of the difficulties in understanding typical aragonitic ooid formation is the fact that the aragonite needles, or battens, are arranged with their c crystallographic axes parallel to the solid surface. Bathurst (1974) observed that the... [Pg.234]

Lowenstam H.A. and Epstein S. (1957) On the origin of sedimentary aragonite needles of the Great Bahama Bank. J. Geol. 65, 364-375. [Pg.645]

Figure 14. Photomicrograph (plane polarized light) of coalesced aragonite needles in Millers Chamber popcorn deposit. Arrows point to several of the elongate inclusions developed along the seams where adjacent needles coalesced. Figure 14. Photomicrograph (plane polarized light) of coalesced aragonite needles in Millers Chamber popcorn deposit. Arrows point to several of the elongate inclusions developed along the seams where adjacent needles coalesced.
Poorly formed Mg-silicate platelets made up the acid-insoluble residue of aragonite crusts. XRD and EDX microanalysis of this material by Polyak and Guven (2000) suggested that it was kerolite or kerolite-like. Kerolite is a non-expandable hydrous phyllosilicate with a chemical composition and X-ray diffraction pattern similar to talc and stevensite (Brindley et ak, 1977). The clay fills spaces between aragonite needles in cave crusts. [Pg.307]

Nonskeletal carbonates Oolite sand (Ot) Aragonite needles (At)... [Pg.27]

The morphologies of PCC used as fillers are commonly scalenohedral (rosetteshaped), rhombohedral (cubic-shaped) or aragonite (needle-shaped). The type of morphology is defined by process parameters Kke temperature, pressure, reaction speed, additives etc. The particles can be arranged as individual discrete, clustered or agglomerated. These different arrangements represent an additional tool to influence the overall pigment performance. [Pg.50]

See other pages where Aragonite needles is mentioned: [Pg.396]    [Pg.442]    [Pg.468]    [Pg.468]    [Pg.469]    [Pg.519]    [Pg.539]    [Pg.53]    [Pg.54]    [Pg.179]    [Pg.222]    [Pg.227]    [Pg.227]    [Pg.228]    [Pg.228]    [Pg.229]    [Pg.229]    [Pg.230]    [Pg.233]    [Pg.235]    [Pg.235]    [Pg.239]    [Pg.603]    [Pg.3534]    [Pg.3542]    [Pg.3542]    [Pg.284]    [Pg.305]    [Pg.372]    [Pg.373]    [Pg.98]    [Pg.202]    [Pg.203]    [Pg.9]    [Pg.312]    [Pg.41]    [Pg.192]   
See also in sourсe #XX -- [ Pg.468 , Pg.519 , Pg.539 ]



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