| Rank | Country | World Production, By Country (Thousand metric tons) |
|---|
| 1 | United States | 21,100 |  |
| 2 | Spain | 13,200 |  |
| 3 | Thailand | 8,355 |  |
| 4 | Mexico | 7,000 |  |
| 5 | United Kingdom | 2,900 |  |
| 6 | Russian Federation | 2,200 |  |
| 7 | Poland | 1,250 |  |
| 8 | Uruguay | 1,130 |  |
| 9 | Saudi Arabia | 750 |  |
| 10 | Morocco | 600 |  |
| 11 | Pakistan | 590 |  |
| 12 | South Africa | 554 |  |
| 13 | Portugal | 500 |  |
| 14 | Romania | 500 |  |
| 15 | Syrian Arab Republic | 470 |  |
| 16 | Turkey | 250 |  |
| 17 | Switzerland | 250 |  |
| 18 | Libyan Arab Jamahiriya | 175 |  |
| 19 | Peru | 150 |  |
| 20 | Nigeria | 150 |  |
| 21 | United Arab Emirates | 130 |  |
| 22 | Slovakia | 120 |  |
| 23 | Tunisia | 115 |  |
| 24 | Turkmenistan | 100 |  |
| 25 | Oman | 60 |  |
| 26 | Serbia and Montenegro | 50 |  |
| 27 | Mauritania | 39 |  |
| 28 | Tajikistan | 35 |  |
| 29 | Tanzania, United Republic Of | 33 |  |
| 30 | Moldova, Republic Of | 32 |  |
| 31 | Nicaragua | 30 |  |
| 32 | Mongolia | 26 |  |
| 33 | Macedonia, The Former Yugoslav Republic Of | 20 |  |
| 34 | Niger | 18 |  |
| 35 | Sudan | 14 |  |
| 36 | Venezuela | 7 |  |
| 37 | Paraguay | 5 |  |
Year of Estimate: 2006
Source: United States Geological Survey (USGS) Minerals Resources Program