Correction: Nikopoulou et al. Microscopic, Spectroscopic and Chemical Analysis of Emeralds from Habachtal, Austria. Minerals 2025, 15, 22

Text Correction

The original publication [1] contained an error due to data reduction being conducted with incorrect use of the internal standard. As specified in [1], it was intended to use silicon (²⁹Si) as the internal standard, applying 31.35 wt %. However, SiO₂ at 31.35 wt % was mistakenly used for the data reduction instead. As a result, all reported LA–ICP–MS data are significantly lower than they should be.

A correction has been made to Section 3. Results and Discussion, Section 3.7. Laser Ablation–Inductively Coupled Plasma–Mass Spectrometry (LA–ICP–MS), first and second paragraph:

The ICP method was used for the accurate calculation of trace elements in 27 emerald samples. All samples studied with the LA–ICP–MS technique revealed similar results (Table 3), which show that Austrian emeralds contain Na₂O below 2.43% and MgO between 1.88% and 3.80%, with Na₂O/MgO below 1 for all analyses, while Cr/V ratios range from 5.38 to 36.36 (see also Table S1). The sum of the concentrations of all alkali metals (Li + Na + K + Rb + Cs) ranges from 1.28% to 1.87%. The amount of Cs was considered at around 370 ppmw [30,56], and the LA–ICP–MS results of this study revealed concentrations from around 115 to 390 ppmw. Relatively low contents of Li (below 195 ppmw), V (below 250 ppmw), K (below 385 ppmw), and Rb (below 25 ppmw) were also observed.

LA–ICP–MS analysis of Egyptian emeralds (Table 4) also presents low concentrations of Li (74.86–192.58 ppmw) but higher amounts of Rb (20.76–133.64 ppmw), V (255.44–429.82 ppmw), and K (196.47–1221.62 ppmw) compared to emeralds from Austria. Furthermore, the Egyptian emeralds show a relatively lower ratio of Cr/V (2.51–8.38), while the alkali content (Li + Na + K + Rb + Cs) has a narrower range from 1.47% to 1.83% (also see Table S2) compared to Austrian emeralds with a Na₂O/MgO ratio ranging between 0.77 and 0.89.

Error in Figures and Tables

Following the adjustment of the LA–ICP–MS data, the revised

Table 3. Results of trace element analysis for 27 emeralds from Habachtal (Austria) measured by LA-ICP-MS in ppmw.

Samples	Elements	Min	Max	Average	Median
Austria (Habachtal) 27 samples, 95 analyses	Na2O (%)	1.66	2.43	2.12	2.13
	MgO (%)	1.88	3.80	2.49	2.47
	7Li	53.84	191.37	105.41	96.35
	39K	70.35	383.22	163.73	157.17
	45Sc	2.31	359.36	80.27	51.62
	47Ti	0.60	194.58	12.65	6.14
	51V	68.37	240.53	121.87	111.82
	52Cr	668.34	3365.30	1737.40	1637.05
	55Mn	11.44	291.20	30.11	17.92
	57Fe	2777.70	10,949.62	5884.10	6192.24
	59Co	0.34	3.89	1.24	1.17
	60Ni	4.86	59.46	13.99	10.98
	66Zn	6.74	34.21	12.48	11.50
	69Ga	5.73	13.86	8.68	7.90
	85Rb	11.03	22.97	15.21	14.49
	133Cs	113.42	393.07	211.11	199.63
	Cr/V	5.38	36.36	15.36	14.73
	Na2O/MgO	0.54	0.96	0.86	0.87
	Alkalis *	1.28	1.87	1.62	1.63

* Alkalis: ⁷Li + ²³Na + ³⁹K + ⁸⁵Rb + ¹³³Cs.

and

Table 4. Results of trace elements for 4 emerald crystals from Egypt measured by LA-ICP-MS in ppmw.

Samples	Elements	Min	Max	Average	Median
Egypt 4 samples, 10 analyses	Na2O (%)	1.92	2.35	2.14	2.16
	MgO (%)	2.17	2.80	2.53	2.62
	7Li	74.86	192.58	124.30	110.07
	39K	196.47	1221.62	616.85	527.21
	45Sc	173.08	266.36	225.46	235.77
	47Ti	8.93	50.94	17.29	11.42
	51V	255.44	429.82	326.24	305.02
	52Cr	1000.39	2604.22	1507.87	1265.33
	55Mn	17.21	64.81	29.46	24.01
	57Fe	4907.16	6619.24	5444.20	5336.65
	59Co	1.01	3.20	1.96	1.99
	60Ni	16.66	31.58	23.57	23.17
	66Zn	13.80	348.69	71.19	31.17
	69Ga	9.29	15.22	12.51	12.52
	85Rb	20.76	133.64	54.41	25.46
	133Cs	141.23	327.80	198.13	188.92
	Cr/V	2.51	8.38	4.85	4.92
	Na2O/MgO	0.77	0.89	0.85	0.86
	Alkalis *	1.47	1.83	1.69	1.75

* Alkalis: ⁷Li + ²³Na + ³⁹K + ⁸⁵Rb + ¹³³Cs.

appear below and contain the data processed using the correct internal standard.

Following the corrections made in the text and to the tables, the updated Figure 12 appears below:

The supplementary materials related to the LA–ICP–MS analysis have also been corrected accordingly.

The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.