"Table 10.  X-ray diffraction mineralogy of ferromanganese deposits.
[Intervals measured from the outer surface of crusts and nodules.  B, bulk crust; BS, bulk side crust, usually granular texture; BU, bulk underside crust; L, crust layer; LU, layer from underside crust; BN, bulk nodule; NN, nodule nucleus; MB, manganiferous breccia. Percentages were determined by using the following weighting factors relative to quartz set at 1: _-MnO2 70; todorokite 10; birnessite 12 (Hein and others, 1988); plagioclase 2.8; calcite 1.65; smectite 3.0; goethite 7.0; phillipsite 17.0; illite 6.0; halite 2.0 (From Cook and others, 1975). The limit of detection for each mineral falls between 0.2 and 1.0 percent, except the manganese minerals, which are greater, perhaps as much as 10 percent for _-MnO2.  mm, millimeters; %, percent; _, delta]"			
Sample	Type and interval (mm)	"d-MnO2
(%)"	"Others
(%)"
D3-4A	B (0-10)	82	"12-Plagioclase, 6-quartz"
D3-5A	B (0-10)	87	"7-Plagioclase, 6-quartz,  <1-smectite"
D3-7A	B (0-4)	87	"7-Plagioclase, 6-quartz"
D4-1A	B (0-3)	95	"3-Plagioclase, 2-quartz"
D4-3A	B (0-4)	92	"5-Quartz, 3-plagioclase"
D5-1A	B (0-25)	93	"4-Plagioclase, 3-quartz"
D5-1B	L (0-15)	91	"6-Plagioclase, 3-quartz"
D5-1C	L (15-21)	96	"3-Plagioclase, 1-quartz"
D5-2A	B (0-10)	88	"6-Plagioclase, 6-quartz"
D5-3A	B (0-16)	88	"7-Plagioclase, 5-quartz"
D5-3E	BS	96	"3-Plagioclase, 1-quartz"
D5-6	B (0-15)	86	"9-Plagioclase, 5-quartz"
D5-16A	BS (0-6)	94	"4-Plagioclase, 1-quartz, 1-chabezite(?)"
D5-17A	B (0-12)	82	"10-Plagioclase, 6-quartz, 2-todorokite"
D6-1A	B (0-15)	69	"18-Plagioclase, 9-quartz, 3-todorokite, 1-smectite"
D6-1B	B (0-10)	88	"5-Plagioclase, 4-quartz, 3-todorokite"
D6-2	B (0-15)	77	"8-Todorokite, 6-dolomite, 5-plagioclase, 4-quartz"
D6-10	B (0-30)	80	"10-Todorokite, 6-plagioclase, 4-quartz"
D6-34A	L (0-6)	81	"8-Todorokite, 6-quartz, 5-plagioclase"
D6-34B	L (6-18)	95	"3-Plagioclase, 1-quartz, 1-todorokite"
D6-37	B (0-15)	86	"7-Plagioclase, 6-quartz, 1-smectite"
D7-2C	B (0-10)	85	"10-Plagioclase, 5-quartz"
D7-5	B (0-15)	63	"23-Todorokite, 7-quartz, 7-plagioclase"
D7-8	B (0-24)	94	"3-Plagioclase, 3-quartz"
D8-1A	B (0-18)	81	"12-Plagioclase, 6-quartz, 1-todorokite"
D8-2B	L (0-12)	85	"9-Plagioclase, 6-quartz"
D8-2C	L (12-37)	86	"5-Todorokite, 6-plagioclase, 3-quartz"
D8-2D	L (37-65)	89	"6-Plagioclase, 2-goethite, 3-quartz"
D8-3B	L (0-5)	86	"9-Plagioclase, 5-quartz"
D8-3C	L (5-17)	90	"4-Plagioclase, 3-quartz, 3-todorokite"
D8-3D	L (17- 36)	86	"9-Plagioclase, 5-quartz"
D8-5	BN (0-25)	78	"9-Todorokite, 7-quartz, 6-plagioclase"
D8-10	NN	53	"19-Plagioclase, 11-todorokite, 10-dolomite, 6-quartz, 1-smectite"
D9-9A	B (0-35)	85	"9-Todorokite, 3-plagioclase, 3-quartz"
D9-14A	B (0-7)	90	"5-Todorokite, 3-plagioclase, 2-quartz"
D9-14B	L (0-30)	91	"4-Todorokite, 3-plagioclase, 2-quartz"
D9-14C	L (0-20)	85	"8-Todorokite, 3-plagioclase, 3-quartz, 1-smectite"
D9-16A	B (0-55)	87	"9-Todorokite, 2-plagioclase, 2-quartz, <1-smectite"
D9-16B	L (0-10)	80	"10-Todorokite, 3-quartz, 3-plagioclase, 3-birnessite"
D9-16C	L (10-55)	87	"7-Todorokite, 2-plagioclase, 2-birnessite, 1-quartz, 1-smectite"
D9-21A	B (0-50)	88	"5-Todorokite, 3-birnessite(?), 2-plagioclase, 2-quartz"
D9-21B	L (0-4)	98	"1-Illite(?), 1-plagioclase(?)"
D9-21C	L (4-29)	97	"1-Plagioclase, 1-quartz, 1-smectite"
D9-21D	L (29-54)	90	"5-Todorokite, 3-plagioclase, 2-quartz"
D9-23	BN (0-55)	86	"7-Todorokite, 3-plagioclase, 3-quartz, 1-smectite"
D9-29	B (0-55)	88	"7-Todorokite, 3-plagioclase, 2-quartz"
D9-31	B (0-4)	90	"6-Quartz, 4-plagioclase"
D9-34A	B (0-12)	91	"5-Quartz, 4-plagioclase"
D9-41	B (0-40)	96	"2-Plagioclase, 2-quartz"
D10-3	B (0-40)	63	"17-Todorokite, 6-phillipsite, 5-barite, 4-illite, 3-quartz, 2-smectite"
D10-4A	B (0-20)	71	"12-Todorokite, 6-plagioclase, 3-barite, 3-quartz, 2-illite, 2-phillipsite, 1-smectite"
D10-6	B (0-40)	88	"5-Plagioclase, 5-todorokite, 2-quartz"
D10-7A	B (0-25)	93	"4-Plagioclase, 3-quartz"
D10-7B	L (0-3)	72	"15-Plagioclase, 13-quartz"
D10-7C	L (3-25)	97	"2-Plagioclase, 1-quartz"
D11-4A	L (0-8)	79	"13-Plagioclase, 8-quartz"
D11-4B	L (8-27)	91	"4-Todorokite, 2-plagioclase, 2-goethite, 1-quartz"
D11-4C	L (27-33)	92	"3-Goethite, 2-plagioclase, 2-todorokite, 1-quartz"
D11-6	B (0-50)	88	"6-Plagioclase, 3-quartz, 3-todorokite"
D11-7	B (0-45)	84	"7-Quartz, 6-plagioclase, 3-todorokite"
D11-11A	B (0-70)	92	"3-Plagioclase, 3-quartz, 2-todorokite"
D13-1A	B (0-12)	75	"17-Plagioclase, 8-quartz"
D13-1B	MB	17	"57-Goethite, 18-plagioclase, 8-quartz"
D13-1C	BU (0-4)	72	"11-Todorokite, 8-phillipsite, 3-quartz , 2-plagioclase, <1-smectite"
D13-2A	B (0-12)	77	"8-Plagioclase, 9-birnessite, 4-todorokite, 2-quartz"
D13-2C	BU (0-10)	63	"11- Barite, 9-todorokite, 8-plag, 4-birnessite, 3-quartz , 2-smectite"
D13-3A	B (0-27)	77	"7-Plagioclase, 6-todorokite, 5-goethite, 5-quartz"
D14-1A	B (0-40)	88	"6-Plagioclase, 4-quartz"
D14-1C	BU (0-15)	71	"15-Todorokite, 5-birnessite, 3-plag, 3-goethite, 2-quartz, 1-smectite"
D14-2C	B (0-6)	87	"7-Plagioclase, 6-quartz"
D14-2D	LU (0-5)	82	"7-Todorokite, 6-plagioclase, 5-quartz"
D14-2E	LU (5-11)	81	"8-Plagioclase, 7-quartz, 4-todorokite"
D14-3	B (0-9)	86	"8-Quartz, 6-plagioclase"
D14-4	B (0-40)	94	3-Quartz  3-plagioclase
D17-1	B (0-18)	91	"4-Plagioclase, 3-quartz, 2-goethite"
D17-3A	B (0-10)	90	"5-Plagioclase, 5-quartz"
D17-4	B (0-25)	91	"5-Quartz, 3-plagioclase, 1-goethite"
D17-6A	B (0-18)	93	"3-Plagioclase, 2-quartz, 2-goethite"
D17-6B	B (0-10)	95	"4-Plagioclase, 1-quartz, 1-calcite"
D17-22	B (0-25)	94	"2-Plagioclase, 2-quartz, 2-goethite"
D21-1A	B (0-15)	98	"1-Plagioclase, 1-quartz"
D23-2B	B (0-18)	88	"5-Plagioclase, 3-quartz, 3-birnessite, 1-smectite"
D23-2C	B (0-20)	85	"7-Plagioclase, 5-quartz, 3-todorokite"
D23-3	B (0-18)	92	"3-Plagioclase, 3-quartz, 1-smectite, 1-goethite"