brittle crystals
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CrystEngComm ◽  
2021 ◽  
Author(s):  
Udaya B. Rao Khandavilli ◽  
Aoife M. Buckley ◽  
Anita R. Maguire ◽  
Mangalampalli S. R. N. Kiran ◽  
Upadrasta Ramamurty ◽  
...  

Two epimeric series of esters exhibit distinct mechanical behaviour: brittle crystals for one series and ductile crystals for the other series.


2019 ◽  
Vol 155 ◽  
pp. 315-322 ◽  
Author(s):  
Ni Chen ◽  
Liang Li ◽  
Jinming Wu ◽  
Jun Qian ◽  
Ning He ◽  
...  

2015 ◽  
Vol 79 (5) ◽  
pp. 1143-1157 ◽  
Author(s):  
Adam Pieczka ◽  
Frank C. Hawthorne ◽  
Mark A. Cooper ◽  
Eligiusz Szełęg ◽  
Adam Szuszkiewicz ◽  
...  

AbstractPilawite-(Y), ideally Ca2(Y,Yb)2Al4(SiO4)4O2(OH)2, was discovered in a pegmatite near Piława Górna, Lower Silesia, Poland. The mineral occurs as white, translucent, brittle crystals up to 1.5 mm in size. It has a white streak, vitreous lustre and a hardness of 5 on Mohs scale. The calculated density is 4.007 g/cm3. Pilawite-(Y) is non-pleochroic, biaxial (+), with refractive indices α = 1.743(5), β = 1.754(5) and γ = 1.779(5), birefringence Δ = 0.03–0.04, 2Vmeas. = 65(2)° and 2Vcalc. = 68°. Pilawite-(Y) is monoclinic P21/c, with unit-cell parameters a = 8.558(3) Å, b = 7.260(3) Å, c = 11.182(6) Å, β = 90.61(4)o, V = 694.7(4) Å3. The crystal structure was refined to an R1 index of 2.76% and consists of chains of edge- and corner-sharing octahedra decorated by tetrahedra and having the stoichiometry [Al2(SiO4)4O(OH)] that link by sharing corners to form an octahedron–tetrahedron framework with large interstices that contain Ca2+ and (Y,Ln)3+. It is a graphical isomer of the Al–P framework in palermoite, Sr2Li4[Al2(PO4)2(OH)2]2. The pilawite-(Y)-bearing assemblage began crystallization at high Y + Ln activities and was modified progressively by a Ca-enriched fluid, resulting in the sequence: keiviite-(Y) → gadolinite-(Y) to hingganite-(Y) + hellandite-(Y) → pilawite-(Y) → allanite-(Y) → epidote/zoisite.


2011 ◽  
Vol 27 (1) ◽  
pp. 141-151 ◽  
Author(s):  
Philip R. Howie ◽  
Sandra Korte ◽  
William J. Clegg

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