Comparison of Chemical Composition and Spectroscopy of Purple-Brownish Red Garnet From Zambia, Tanzania and Australia

Yuan ZHONG; Meng-wen QU; Hsitien Shen Andy

doi:10.3964/j.issn.1000-0593(2022)01-0184-07

Spectroscopy and Spectral Analysis, Volume. 42, Issue 1, 184(2022)

Comparison of Chemical Composition and Spectroscopy of Purple-Brownish Red Garnet From Zambia, Tanzania and Australia

Yuan ZHONG, Meng-wen QU, and Hsitien Shen Andy^*;

Author Affiliations

Gemmological Institute, China University of Geosciences (Wuhan), Wuhan 430074

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Figures & Tables(12)

Fig. 1. Garnet samples from three localities
A1—A14: Samples from Australia; T1—T5: Samples from Tanzania; ZP1—ZR222: Samples from Zambia

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Fig. 2. Samples from three localities plotted according to different pairs of chemical components
(a): MgO; (b): Co; (c): CaO; (d): Li

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Fig. 3. Chondrite-normalized REE patterns of garnets from three localities
Chondrite data cited from Ref. [8]

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Fig. 4. Raman spectra of several samples
ZP222: Zambia; T3: Tansania; A4: Australia

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Fig. 5. Colors of garnets from three localities distributed in L^*a^*b^* color space (only a^*, b^* coordinates were drawn)

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Fig. 6. UV-Vis spectrum of garnets from three localities
(a): Group ZP from Zambia; (b): Group ZR from Zambia; (c): Group from Tanzania; (d): Group from Australia

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Fig. 7. Linear Regression of ratio between absorbanceat 368 and 503 nm (a) and b^*, and linear Regression of ratio between absorbanceat 425 and 503 nm and b^* (b)

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Table 1. Range of chemical components in garnet samples from three localities

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Table 1. Range of chemical components in garnet samples from three localities

	坦桑尼亚	赞比亚	澳大利亚
主量成分/Wt%
MgO	13.5~14.5	12.9~17.8	10.3~10.7
Al₂O₃	21.6~21.9	21.6~22.4	21.3~21.6
SiO₂	41.5~41.6	40.4~41.9	40~40.7
CaO	0.41~0.87	0.52~1.97	0.86~0.98
MnO	0.08~0.24	0.18~0.91	0.99~1.18
FeO	20.2~21.2	16.2~21.8	24.5~25.1
微量元素/ppmw
Li	19.5~36.3	4.68~12	2.12~3.79
Na	130~297	70.5~272	165~200
P	598~962	278~759	381~462
Sc	8.06~52.9	16.3~66.4	89.3~101
Ti	16.5~65.3	6.65~218	113~262
V	3.02~32.7	14.7~71.4	22.8~32
Co	11.9~13.3	5.3~28.7	16.6~18.6
Zn	3.76~62.9	24.7~67.7	40.8~49.5
Ga	4.72~8.82	5~10.8	6.95~9.9
Y	20.8~49.6	14.5~146	326~417
Zr	17.1~23.6	12.3~46	21.6~26.5
Hf	0.23~0.4	0.29~0.77	0.22~0.41
$\sum REE$	15.9~31.8	10.2~88.1	147~229

Table 2. Coefficients of different element variables in canonical discriminant functions and standard canonical discriminant functions

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Table 2. Coefficients of different element variables in canonical discriminant functions and standard canonical discriminant functions

变量	典则判别函数		标准化典则判别函数
变量	F1系数	F2系数	F1_std系数	F2_std系数
MgO	5.386	0.999	7.229	1.341
Al₂O₃	-1.104	2.764	-0.204	0.510
CaO	-6.766	7.477	-2.515	2.779
MnO	3.668	11.889	0.621	2.014
FeO	4.797	0.575	6.890	0.827
Li	-0.142	-0.812	-0.448	-2.562
Na	-0.005	0.014	-0.269	0.842
P	0.001	0.003	0.086	0.463
Sc	0.195	-0.101	2.566	-1.330
Ti	0.011	-0.005	0.737	-0.341
V	-0.010	0.066	-0.146	0.987
Co	-0.679	0.223	-3.215	1.054
Zn	0.006	0.140	0.093	2.013
Ga	-0.585	-0.317	-0.916	-0.497
Y	0.040	-0.006	1.466	-0.223
Zr	-0.179	-0.030	-1.16	-0.192
1(常数项)	-140.973	-99.922	-	-

Table 3. Vibration modes of different Raman peaks and wavenumber ranges of Raman peaks of samples from different localities(peaks are consistent with Fig.4)

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Table 3. Vibration modes of different Raman peaks and wavenumber ranges of Raman peaks of samples from different localities(peaks are consistent with Fig.4)

归属^[9]	峰位	振动模式^[9]	澳大利亚/cm^-1	坦桑尼亚/cm^-1	赞比亚/cm^-1
Si—O伸缩振动	a	F_2g	1 045~1 050	1 049~1 055	1 050~1 058
	b	A_1g	917~920	921~923	920~928
	c	F_2g	865~867	866~870	864~871
Si—O弯曲振动	d	F_2g	635~639	638~641	639~647
	e	A_1g	556~560	559~561	559~566
	f	F_2g	501~505	504~507	505~512
[SiO₄]转动	g	F_2g	349~352	354~355	354~358
[SiO₄]平动	h	E_g/F_2g	207~211	209~212	206~212

Table 4. Pearson correlation coefficients between wavenumber of Raman peaks and content of chemical components

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Table 4. Pearson correlation coefficients between wavenumber of Raman peaks and content of chemical components

拉曼峰位 (波数)	和不同化学成分(含量)的相关系数
拉曼峰位 (波数)	MgO	FeO	MnO	CaO
a	0.875	-0.880	-0.637	-0.058
b	0.926	-0.893	-0.685	-0.348
c	0.590	-0.553	-0.424	-0.466
d	0.855	-0.839	-0.658	-0.139
e	0.918	-0.883	-0.698	-0.275
f	0.905	-0.900	-0.753	-0.141
g	0.973	-0.973	-0.785	0.064
h	-0.299	0.268	0.467	-0.072

Table 5. UV-Vis absorption bands and their color-causing ions and energy level transitions
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Table 5. UV-Vis absorption bands and their color-causing ions and energy level transitions
波长/nm 致色离子能级跃迁^[10]
368 Fe³⁺ ⁶A_1g→⁴E_g(D)
398 Fe²⁺ ⁵E_g→³A_1g(³G)
407 Mn²⁺ ⁶A_1g→⁴A_1g+⁴E_g(⁴G)
425 Fe³⁺ ⁶A_1g→⁴A_1g+⁴E_g(⁴G)
461, 503, 523 Fe²⁺ ⁵E_g→³E_1g(³H)
574, 617, 696 Fe²⁺ ⁵E_g→³T_1g(³H)

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Yuan ZHONG, Meng-wen QU, Hsitien Shen Andy. Comparison of Chemical Composition and Spectroscopy of Purple-Brownish Red Garnet From Zambia, Tanzania and Australia[J]. Spectroscopy and Spectral Analysis, 2022, 42(1): 184

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Paper Information

Category: Research Articles

Received: Nov. 23, 2020

Accepted: --

Published Online: Mar. 31, 2022

The Author Email:

DOI:10.3964/j.issn.1000-0593(2022)01-0184-07

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Range of chemical components in garnet samples from three localities

Table 1. Range of chemical components in garnet samples from three localities

Table 2. Coefficients of different element variables in canonical discriminant functions and standard canonical discriminant functions

Table 2. Coefficients of different element variables in canonical discriminant functions and standard canonical discriminant functions

Table 3. Vibration modes of different Raman peaks and wavenumber ranges of Raman peaks of samples from different localities(peaks are consistent with Fig.4)

Table 3. Vibration modes of different Raman peaks and wavenumber ranges of Raman peaks of samples from different localities(peaks are consistent with Fig.4)

Table 4. Pearson correlation coefficients between wavenumber of Raman peaks and content of chemical components

Table 4. Pearson correlation coefficients between wavenumber of Raman peaks and content of chemical components

Table 5. UV-Vis absorption bands and their color-causing ions and energy level transitions

Table 5. UV-Vis absorption bands and their color-causing ions and energy level transitions