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Volume 88, 1960-61
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Table. I —X-ray Powder Diffraction Data for Hyacinth

Snowy River, south-western Nelson, New Zealand (x-ray films Nos. 1123, 1124). Nickel-filtered copper radiation (CuKa = 1.5418 Å). Camera diameter = 114.59 mm; cut-off at 18.5 Å ca. Spacings corrected for film shrinkage. Disordered form:

ao = 6.625 Å, co = 6.010 Å. Ordered form ao = 6.605 Å, co = 5.978 Å.

A B
hkl d. calc. d. meas. I d. calc. d. meas. I
101 4.4615 4.47 50 4.439 4.43 50
200 3.3143 3.315 100 3.305 3.29 100
211 2.658 2.662 10 2.649 2.647 15
112 2.529 2.53 60 2.517 2.518 60
220 2.343 2.34 15 2.337 2.333 25
202 2.226 2.226 10 2 .165 2.216 20
301 2.073 2.072 30 2.066 2.066 35
103 1.918 1.919 15 1.907 1.913 25
222 1.8405
321 1.757 1.757 15 1.751 1.750 25
312 1.719 1.720 40 1.7125 1.710 50
213 1.652
400 1.6565 1.656 15 1.651 1.650 35
411 1.553 1.549 2 1.548 1.544 5
004 1.503 1.506 3 1.495 1.495 5
303 1.478
420 1.4815 1.480 10 1.4775 1.475 25
402 1.446
332 1.386 1.386 15 1.381 1.380 35
204 1.368 1.368 8 1.362 1.364 20
323 1.349
422 1.324
501, 431 1.294 1.292 5 1.290 1.289 15
224 1.265 1.266 6 1.259 1.262 20
413 1.253 1.251 1 1.2485 1.248 3
314 1.215 1.218 1D
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521 1.193 1.191 8 1.200 1.201 1D
512 1.189 1.189 30
105 1.177
440 1.171 1.171 <1D 1.168 1.167 5
215, 404 1.113 1.113 2 1.108 1.110 10
503, 600, 433 1.104 1.104 3D 1.101 1.1015 10
611 1.072 1.069 1.068 1
532 1.063 1.062 4D 1.059 1.059 15
424, 305 1,055 1,054 4D 1.051 1.052 15
523, 620 1.048 1.047 3D 1.045 1.045 8
541 1.0165
325 1.006 1.006 1D 1.001 1.003 1
622 .986
116 .979 .979 2D .974 .9765 5
631 .974 .9715 .971 2
415 .962 .958 .958 1
206 .954
613 .957 .9535 .9535 2
701 .932 .932 2
444 .920 .9215 5
640 .9165
543 .916 .916 10
534 .903 .902 5
316 .899 .899 1
721 .897
712, 552 .892 .892 20
604, 505 .887 .886 2
633 .883
525, 624 .856 .857 20
703, 406 .853
107 .847
336 .839
651 .837
732 .833 .833 25
800, 723 .826 .825 3
217 .821
811, 741 .812 .812 3
615 .805
820 .801 .801 .5
307 .7965
802 .792 .792 30D
516 .790
644 .781 .781 30D
563 .7785
237 .774
822 .773

A. Disordered form of hyacinth.

B. Ordered form of hyacinth after having been heated to 760° C. for 15 minutes in air or in vacuo.

I = Intensities were determined visually. D = Diffuse reflection.

The unit cell dimensions of heat-treated Snowy River hyacinth are almost identical to the values recorded by Swanson et al. (1955, p. 69) for zircon. Constants determined for hyacinth are as follows: ao = 6.605 Å and co = 5.978 Å, and these data are to be compared to ao = 6.604 Å and co = 5.979 Å for the exceedingly pure zirconium silicate employed by the National Bureau of Standards for their measurements.

Specific gravities have been determined for natural hyacinth and the heat-treated mineral, but it must be stressed that these data have not been observed for the actual crystals for which cell dimensions have been measured, but instead,

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Fig. 1. —c-axis rotation photographs of hyacinth from Snowy River. south-western Nelson. New Zealand. Nickel-filtered copper radiation and camera diameter = 57.29 mm.
A (upper). Hyacinth before heat-treatment. X-ray film No. 1038.
B (lower). Hyacinth after having been heated in air for 30 minutes at 860° C., with a superimposed powder pattern due to recrystallized samarskite inclusion. This powder photograph may be compared to that illustrated in Fig. 2C. X-ray film No. 1130.

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Fig. 2.—X-ray diffraction powder patterns of samarskite. Nickel-filtered copper radiation (CuKa = 1.5418 Å). Camera diameter = 114.59 mm. Cut-off = 18.5 Å ca.
A. Heated in air to 600° C. for 30 minutes. Exposure time = 5.3 hours, aperture No. 3. Film No. 1154. Spruce Pine. Mitchell Co., North Carolina.
B. Heated in air to 860° C. for 30 minutes. Exposure time = 5.6 hours, aperture No. 1 Film No. 1150. Spruce Pine, Mitchell Co., North Carolina.
C. Inclusion material from hyacinth. Heated in zircon in an to 860° C. for 30 minutes. Exposure time = 4.9 hours, aperture No. 3. Film No. 1131. A Snowy River. Mawheraiti S.D., south-western Nelson, New Zealand.
D. Heated in air to 1000° C. for 30 minutes. Exposure time = 5.3 hours, aperture No. 4. Film No. 1155. Spruce Pine, Mitchell Co., North Carolina.
E. Inclusion material removed from hyacinth and heated in air to 1000° C. for 30 minutes. Exposure time = 6.0 hours, aperture No. 4. Film No. 1134. Snowy River, Mawheraiti S.D., south-western Nelson, New Zealand.

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10–15 mgm amounts of carefully hand-picked hyacinth crystals were used. These data are as follows:

Natural Hyacinth Heat-treated Hyacinth
Sp. gr. meas. at 20° C. 4.58 ± 0.01 4.63 ± 0.01
Sp. gr. calc. from cell dimensions 4.585 4.638