= [
'gemstone_composition' => [
'#title' => 'Chemical Composition',
'#type' => 'select',
'#description' => 'Choose the chemical composition that all gems in your input file fall into.',
'#required' => FALSE,
'#options' => [
'borate' => 'Borate (e.g. Howlite)',
'carbon' => 'Carbon (e.g. Diamond)',
'carbonate' => 'Carbonate (e.g. Azurite, Calcite, Malachite)',
'halide' => 'Halide (e.g. Fluorite)',
'igneous' => 'Igneous Rock (e.g. obsidian, lava stone)',
'organic' => 'Organic (e.g. Amber, Pearl)',
'silicate' => 'Silicate (e.g. Amazonite, Danburite, Lepidolite)'
],
'#empty_option' => '- Select -',
],
]