Question: what makes the blue lagoon in iceland blue
[{'answer': 'The silicate minerals'}, {'provenance': [{'wikipedia_id': '2519487', 'title': 'Blue Lagoon (geothermal spa)', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 554, 'bleu_score': 0.604761944989862, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12572784333554070905}, 'section': 'Section::::History.:Water source.\n'}]}]