| 0 | KAEMMERERITE (the chromium rich variety of cliniclore) |
| 0 | KAOLINITE (Aluminum Silicate Hydroxide) |
| 0 | KERMESITE (Antimony Oxysulfide) |
| 0 | KERNITE (Hydrated Sodium Borate) |
| 0 | KIDWELLITE (Hydrated Sodium Iron Phosphate Hydroxide) |
| 0 | KIESERITE (Hydrated Magnesium Sulfate) |
| 0 | KINOITE (Hydrated Calcium Copper Silicate) |
| 0 | KNAUFITE (alternate name for VOLBORTHITE, Copper Vanadate Hydroxide) |
| 0 | KOLWEZITE (Copper Cobalt Carbonate Hydroxide) |
| 0 | KORNERUPINE (Magnesium Aluminum Iron Boro-silicate Hydroxide) |
| Sale! 1 | KOTTIGITE (Hydrated Zinc Arsenate) |
| 0 | KOVDORSKITE (Hydrated Magnesium Carbonate Phosphate Hydroxide) |
| 0 | KTENASITE (Hydrated Copper Zinc Sulfate Hydroxide) |
| 0 | KULANITE (Barium Iron Manganese Magnesium Aluminum Phosphate Hydroxide) |
| Sale! 6 | KUNZITE (variety of Spodumene) |
| 0 | KUPLETSKITE (Potassium Sodium Manganese Iron Titanium Niobium Silicate Hydroxide) |
| 0 | KUTNOHORITE (Calcium Magnesium Carbonate) |
| Sale! 9 | KYANITE (Aluminum Silicate) |