Table 1:

HSE abundances (in pg g ⁻¹) and ¹⁸⁷Os/¹⁸⁸Os composition of quartz and pyrex glass

Sample	Glass Type	Method	Mass (g)	Os	Ir	Ru	Pt	Pd	Re	187Os/188Os	±2σ
Pyrex Glass	Neck	CT	1.035	18.8	105	4.7	5.7	0.3	3.3	0.142	0.004
	Neck	HF-HNO3	0.201	NA	413	234	435	106	55	NA
	Base	CT	1.059	21.5	29.0	2.5	640.9	9.2	2.8	0.231	0.025
	Base	HF-HNO3	0.228	NA	647	101	978	25	26	NA
Quartz Glass	Neck	CT	1.016	6.2	13.3	1.7	2.7	36.8	2.8	0.168	0.005
	Neck	HF-HNO3	0.198	NA	402	31	124	134	25	NA
	Base	CT	0.991	6.5	17.1	1.7	3.3	594	2.2	0.166	0.003
	Base	HF-HNO3	0.198	NA	613	21	115	185	22	NA
	Middle	HF-HNO3	0.210	NA	430	16	68	104	31	NA

Approximately 50 g of pyrex or quartz used to make Carius tubes were cleaned in boiling Aqua Regia and then crushed and powdered using alumina grinding devices. The powders were spiked and digested using Carius tubes (3 days, 270°C) or teflon vials (3 days, 150°C). Because of the volatility of osmium tetraoxide during high-temperature oxidation, we do not report Os concentrations or Os isotopic compositions for HF-HNO₃ experiments. Ru concentrations may also be lower in these experiments due to partial oxidation of Ru^+(VIII) to ruthenium tetraoxide (boiling point = 40°C). Samples are blank corrected to the total procedural blanks run with the experiments (For HF-HNO₃ experiments= 19 pg Ir, 21 pg Ru, 1 pg Pt, 60 pg Pd, 8 pg Re; for Carius Tubes experiments= 0.2 ± 0.2 pg Os, 1.8 ± 1.1 pg Ir, 1.1 ± 1.2 pg Ru, 9.4 ± 5.2 pg Pt, 5.9 ± 0.63 pg Pd, 0.91 ± 0.19 pg Re, ¹⁸⁷Os/¹⁸⁸Os = 0.165 ± 0.011, n = 4 - note, these TPB differ from the TPB cohort run with lunar mare basalt samples). NA = not analysed.