Chemical Constituents and Spectra Characterization of Gem-Grade Triplite

Yang LÜ; Jing-cheng PEI; Ya-ting GAO; Bo-yu CHEN

doi:10.3964/j.issn.1000-0593(2022)04-1204-05

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 4 >Page 1204 > Article

Spectroscopy and Spectral Analysis
Vol. 42, Issue 4, 1204 (2022)

Chemical Constituents and Spectra Characterization of Gem-Grade Triplite

Yang LÜ, Jing-cheng PEI^*;, Ya-ting GAO, and Bo-yu CHEN

Author Affiliations

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

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DOI: 10.3964/j.issn.1000-0593(2022)04-1204-05 Cite this Article

Yang LÜ, Jing-cheng PEI, Ya-ting GAO, Bo-yu CHEN. Chemical Constituents and Spectra Characterization of Gem-Grade Triplite[J]. Spectroscopy and Spectral Analysis, 2022, 42(4): 1204 Copy Citation Text

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Fig. 1. Picture of triplite samples

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Fig. 2. Raman spectra of triplite samples

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Fig. 3. Raman spectra of triplite compared with zwieselite and wolfeite in RRUFF

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Fig. 4. Infrared spectra of triplite samples

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Fig. 5. Infrared spectra of triplite compared with zwieselite and wolfeite in RRUFF

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Fig. 6. UV-Visible absorption spectra of triplite

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样品名	颜色	重量/ct	折射率	双折射	密度/(g·cm^-3)	多色性	荧光
L-1	红橙	0.54	1.658~1.673	0.015	3.857	弱, 红橙-黄橙	惰性
L-2	红橙	0.49	1.656~1.673	0.017	3.807	中, 红橙-黄橙	惰性
L-3	红橙	1.42	1.657~1.675	0.018	3.820	强, 红橙-浅黄	惰性

Table 1. Routine gemological parameters of triplite samples

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Sample	L-1	L-2	L-3	Average	巴基斯坦 Shigars 山谷^[1]
CaO	3.169	4.154	4.138	3.820	4.20
Na2O	0.04	0.017	nd	0.019	-
TiO2	0.006	0.004	nd	0.003	-
Al2O3	nd	0.004	nd	0.001	0.06
MgO	0.366	0.739	0.675	0.593	-
SiO2	0.014	0.001	nd	0.005	0.06
FeO*	6.925	5.403	4.551	5.626	3.91
MnO	52.391	52.667	53.498	52.852	54.91
F	7.590	6.047	7.393	7.01	6.87
K2O	0.009	nd	nd	0.003	-
P2O5	31.624	31.328	31.600	31.517	31.92
	102.134	100.364	101.855	101.449	101.93
	3.196	2.546	3.113	2.952	2.89
Total	98.938	97.818	98.742	98.497	99.04

Table 2. Chemical composition characteristics of triplite samples (Wt%)

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拉曼位移/cm^-1			强度	振动归属
L-1	L-2	L-3	强度	振动归属
91	91	89	极弱	晶格振动
276	244	244	极弱	晶格振动
427	427	424	弱	磷酸基团ν₂弯曲振动
450	450	450	弱	磷酸基团ν₂弯曲振动
603	603	607	弱	磷酸基团ν₄弯曲振动
980	980	980	极强	磷酸基团ν₁对称伸缩振动
1 037	1 037	1 037	弱	磷酸基团ν₃反对称拉伸振动
1 075	1 131	1 075, 1 130	弱	磷酸基团ν₃反对称拉伸振动

Table 3. Raman shift and attribution of triplite samples

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矿物名	英文名	化学式	晶系
氟磷锰矿	Triplite	Mn₂[PO₄]F	单斜晶系
羟磷锰矿	Triploidite	Mn₂[PO₄](OH)	单斜晶系
羟磷铁矿	Wolfeite	Fe₂[PO₄](OH)	单斜晶系
氟磷铁矿	Zwieselite	Fe₂[PO₄]F	单斜晶系

Table 4. Triplite group minerals

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峰位/cm^-1			强度	峰位归属
L-1	L-2	L-3	强度	峰位归属
453	457	460	弱	${PO}_{4}^{3 -}$ 基团ν₂对称弯曲振动
595	603	586, 625	中等	${PO}_{4}^{3 -}$ 基团ν₄弯曲振动
975	975	974	弱	${PO}_{4}^{3 -}$ 基团ν₁对称拉伸振动
1 078	1 072	1 070	强	${PO}_{4}^{3 -}$ 基团ν₃反对称拉伸振动
1 134	1 141	1 137	中等	${PO}_{4}^{3 -}$ 基团ν₃反对称拉伸振动

Table 5. Infrared absorption peaks and their attribution of triplite samples

Yang LÜ, Jing-cheng PEI, Ya-ting GAO, Bo-yu CHEN. Chemical Constituents and Spectra Characterization of Gem-Grade Triplite[J]. Spectroscopy and Spectral Analysis, 2022, 42(4): 1204

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